dw, you didn't miss anything. We're all confused too. Yuji never cut Inumaki's arm, which is why it's weird that some fake news came from Jujutsu High to get Yuuta to go there and kill Yuji.
Sukuna was the one who cut his arm off in the battle with Fushiguro's ritual-monster(his attack was a very wide-range one and Inumaki was in that area, a lot of people died it was in chapter 119). And because Sukuna is in Yuuji and a lot of people want him dead this was the perfect opportunity to frame him.
oohhh you right
Did I miss a chapter or something? Where or on what chapter did it show that Inumaki got his arm cut off by Yuji? Can someone explain this to me please? I'm dying of curiosity here ;_;