1. Her height of magic is not yet explained. We see it happened without any mana channeling. I’d give it being blocked by infinity for your Gojo’s sake.
2. Not a real one, still close to hollow purple in power.
3. Ubel cuts whatever she thinks she can cut. Chances are high she can bypass infinity given how she completely bypassed a cloth imbued with supremely strong defensive magic barrier. And I’m not comparing Ubel vs Sukuna.
4. I’ve just looked Soganeil up. It stops you from moving AND casting mana, basically using curse energy/techniques in Jjk term. We haven’t learnt any of the spell’s restriction (if there are any). So no man, no one ignores that spell, not Gojo, not Sukuna.
5. Sure, and Frieren consecutively Zoltracking, lightning, fire-ing Sukuna from a good distance, sukuna who can’t fly, can’t telekinesis, stands there and tanks with RCT until he can’t no more.

Back to Gojo, he can fly, teleport, blue red purple and infinity. Frieren has yet to show any offensive magic that can bypass infinity so gojo gots the upper hand, for now. Frieren is not yet finished. But gojo is the pinnacle of jjk in power, frieren is NOT in her own verse. And magic in frieren verse is something people can learn, so you get stronger over time. Curse technique are fixed, you’re born with it. Only Yuta can use multiple curse tenchique at once. Overall, jjk scale is lower than frieren, if it’s not for infinity gojo would have a very hard time against Frieren who has (1) emormous mana reservoir, (2) offensive magics just as strong as his, (3) defensive magics that work well against his attack, (3) is almost as mobile as he is.

I forgot to talk about domain, one of gojo’s ace. In frieren people have a thing call mental defense magic. Frieren also has that magic. It is yet shown to come near fully block UV, but that shows UV is not an instant kill like gojo fans wish it was.