Weird Question About Yuji in Culling Games and Ch. 214(Prob just got reading comprehension demoned)

Was the reason Yuji suddenly got an insane power-buff in 214 because his body stopped holding Sukuna back so all his power is just focused on fighting then?

I didn't see any indication of what tf happened to him other than Sukuna quoting that he's one of Kenjacku's experiments but this was the only reason I can think of.