I've read a lot of actual myth as well! Some of them do, but many actual youkai also do things like lick grime out of bathrooms or give people rocks that look like babies then turn back into rocks. I've done tons and tons of research since I used to play a character who encountered a lot of them. It's a very fascinating subject. While many of them do eat human flesh as well, there's very little myth that says they actually need it in any case. The whole point of me saying that was to express that no one needs to adhere to what specific myths Touhou is basing itself on- particularly in Genessia.