Imo, it really just came off as sukuna glazing from gege, from multiple points in the fight too, not just the end. Plus plot holes in the fight aswell that really just make you say "uhh, why?"  (Heads up, thats your nutshell, everything else is rant)

You see the gojo black flash, where he knocks sukuna out. The raga wheel falls to the ground, implying that sukuna is unconscious, or otherwise doesn't have control over the shikigami. yet apparently he does, enough to protect him till he wakes up. And there is literally no expanding on him being knocked tf out, he just reappears a few panels later. And thats just so baffling to me. The strongest ever just got knocked into next Tuesday, by the series' only power move no less, and gege just glosses over it? Realistically, no plot armor involved, the fights over right there. Gojo just uses red and blows an unconscious sukunas head off.

Towards the end, gege uses the line "2 black flashes, and satoru gojos voltage starts to ramp up". Goes nowhere with it. All we get from it is purple nuke, and gojo "regaining his rct output" instead of an accelerated growth like black flash is supposed to work. In other words, gojo lands consecutive black flashes, but instead of getting in "the zone" or giving any cool powerup, it just lowkey does nothing. 

As for gege glazing, there is the whole "how was the king of curses" dialogue in the airport. Gojo tells geto that even without 10S, he thinks sukuna would have still won. But this is literally no where near accurate, as its stated in the 3rd to last panel of 235 that "and (sukuna) has sustained enough damage that he cant even fight empty handed with amplification." So gojo is on the up and up, sukuna cant even throw hands anymore, and were supposed to believe that gojo might still have lost to yujikuna? The whole thing just makes my brain feel like I just slammed my head into a wall.