In the text it means any choice you make that sacrifices long term benefits for instant gratification. Nietzsche was way into promoting things that give you pleasure, just not at the cost of your health and prosperity

Obviously Hedonic Philosophy isn't about that either but he wasn't thinking of hedonism as a philosophy, he was describing a problem humans have with how we make choices

Unironically, yes maybe. If it is seen as avoiding your responsibilities, and doesn't contribute to some area of society (but rather sees-to the "worship" of you yourself) then it is hedonistic

Edit: other guy said it better than me