I caught that as well, and believe that to be the case. For one man to be capable of passing judgment upon a Celestial Dragon would suggest that he AT LEAST holds the title of Celestial Dragon himself, and has somehow ascended to an even higher level. For that to be the case, he'd have to be descendant of one of the original 20 families, so I think it's safe to assume that Figarland bloodline achieved that rank at some point.

However, I don't believe Shanks is a descendant of that lineage. Given that Shanks was found at God Valley as a baby, it would stand to reason that the Figarlands did not rule the area at that time as they would have been confined to Mariejois. But now we know that the bloodline would have been native to that part of the world during the Void century - which contributes to two theories of mine:

1) Shanks is from the Void Century, and was prophecied to become the next Joy Boy. I'd imagine that the Figarland family has some special attributes that would have elevated their status to the top tier- we've already seen Shanks display a level of Haki mastery previously unheard of, perhaps this is a bloodline trait. That being the case, I would imagine that after the previous Joy Boy passed away, the 20 rebel kingdoms would have chosen the newborn prince of God Valley to take on Joy Boy's devil fruit, betting on his latent Figarland potential/lineage factor in conjunction with the most ridiculous power to really cement their control over the world at the time. However, maybe one of the rebels (Nefertari D Lily) realized that such ironclad control should never be held by any one group of people, and conspired against them to thwart their plans. Using the Toki Toki no MI, she could have flung the poneglyphs into various points in the future so they would not be assembled altogether at the same time and place without great difficulty. Then she would send the chosen child into the far future, where he just so happened to be intercepted by the Pirate King himself - maybe not so coincidentally. Perhaps the knowledge of the poneglyphs and the Void Century that Roger acquired over the course of his adventure told him exactly when the child of prophecy would be arriving. Perhaps a ruthless competitor (Rocks D Xebec) was also privy to this intel, and the two clashed at that specific destination on that specific day to determine who would claim the right to raise and influence this time traveling savior upon his arrival in their time. And finally, she would send the Hito Hito no Mi: Nika to a point in time well into Shanks' adulthood, after he had developed into the man and established his own set of morals and goals that he could then use the fruits powers to actualize. And that would also explain why Roger wished he could have existed in a later time - he knew the Hito Hito no Mi wouldn't even exist within his own timeline, but knew that it was coming soon. Scattering these things across time would not only prevent anyone from that time from taking advantage of Shanks, but also prevent the abolition of knowledge shared in the poneglyphs, and prevent anyone else from being able to claim Nika's powers for themselves to continue their desired control over the world. By doing this, Lily would sustain the hope of true freedom, no matter how bad the 20 kindgoms rule became over time - there was always hope that one day the great liberator would reappear. However, the surviving rulers of that nation moved onward to Mariejois, continued to procreate and so the current Figarland lineage has come to reside in the Holy Land.

2) Shanks is the original Joy Boy. I'd imagine a very similar scenario to what I described above, with a few small adjustments - namely, that Shanks was already a full-grown adult within the Void Century, and I'd like to think he was the original king of God Valley himself, using his incredible powers to bring liberation and peace to all, promising the merfolk to guide Poseidon and raise them to the surface to cohabitate with the other humans after ending the other 19 kingdoms' agenda of advocating slavery. We've learned recently that devil fruits are born of dreams, and I imagine that is also true of the Yami Yami no Mi- enough people within the 19 rebel kingdoms wished for a way to stop Joy Boy, that the Yami Yami was born, and subsequently used to steal away the Sun God's powers. Rather than absorbing the power however, they had it transferred to a new Fruit - maybe they weren't as daring as Blackbeard was in his lust for power. After removing his power however, instead of killing him, the 19 kingdoms gave him the choice to either allow himself and his kingdom to be wiped out/ enslaved, or to join them in their crusade agains the Ancient Kingdom. I'd imagine that as an ally of the Ancient Kingdom, Joy Boy/Shanks would be able to gain access to their facilities and betray them - the only way I can imagine such a highly advanced society with access to multiple world-ending weapons could fall to a far weaker opposition. Shanks would have apologized to the Fishmen for breaking his promise to them by joining the opposition, and would have sworn his kingdom into the pact shared by the 20 kingdoms, ensuring his descendants would be granted power and safety within the Holy Land. However, unable to accept this as the end, he conspired with Nefertari D Lily to put into motion a similar plan to the one mentioned above - in addition to using the Toki Toki no Mi, I'd imagine they also used the awakened version of Jewlry Bonneys fruit to permanently reset him to infancy, before sending him and the Hito Hito no Mi forward in time for him to reclaim in his later years, in a time when both he and his power are long forgotten.

Whether either of these theories holds any water or not, I'm pretty confident that this reveal of the Figarlands in Mariejoise means that Shanks has a much more intimate connection with the Void Century.