it's most probably referring to when sukuna went on that rampage and ordered all cursed and non cursed objects to "cleave and dismantle". that killed thousands of ppl. inumaki would've been chopped to pieces if he hadn't stopped it with his cursed words technique, that's why he only lost his arm and not his entire body.
Thank you i was confused there too
Sorry to annoy you but do you know what chapter that is?
ch 119 where sukuna was fighting mahoraga
Wait when did yuji cut off inumakis arm?? I cant remember