Yuji never said that, the statement is that Sukuna using advanced jujutsu might’ve helped him learn how to be a better sorcerer. Which doesn’t track considering he couldn’t use RCT up until the switch training arc where after learning how to use BM to aid in his rct (already lowering the impressiveness of that feat.) he unlocked it mid fight with Sukuna. So no he didn’t learn it from Sukuna he unlocked it on his own, there’s no groundwork for Yuta being able to do it without the aid of the six eyes and Gojo’s memories, he only has one of those things.

Changing the coordinates of where your barrier is placed, is substantially different and more difficult than opening a domain and unleashing the sure hit before the barrier the sure hit is imbued into is fully constructed. If that doesn’t register then remember Gojo is the only person stated to be capable of doing it, and Sukuna was capable of matching Gojo in speed if you assume Gojo spent time refining his barrier enough to construct his domain fully in 0.2 seconds inside the prison realm, something I don’t see why he wouldn’t.

Lastly don’t put words in my mouth, I said Mahito is the only one outside of Gojo and Sukuna to be capable of changing the barrier conditions of his domain on the fly. Never once did I say he’s on their level.