Yeah, pretty sure he didn’t lose a digit. I don’t remember that happening in the anime. Probably just cut a bit, getting a bandage.
I will say that when I lived with my ex, she guided me on food prep and cooking, until I could take care of it myself, if I had to. And I definitely did have times where I prepped and cooked the meals myself without needing her supervision. She still basically planned the meals for us, choosing ingredients while we were out shopping and such, but I could take care of the actual making of the food myself just fine.
I don’t recall ever cutting myself, though. But we were well and fully adults by that time, so there’s that, too. Pretty sure I already had practice with a knife and respect for a blade after a childhood of being around them (my dad even had for-show samurai sword sets laying around that I admit to mucking with from time to time; they weren’t nearly as sharp as proper ones, but still didn’t want to have them rub against skin, that’s for sure, and I never did let them)