That has been removed as of a few versions ago already. The whole introduction was changed. Plus, that is the kind of content Patreon does NOT like either, some white knight could've have easily reported the game if they wanted and poof, the dev's Patreon gone.
Is removing signs that say "high school" really going to affect you that much?
The great thing though about the game moving to Steam is, Steam doesn't care about incest, Steam doesn't care about rape, Steam doesn't care about blackmail, Steam doesn't care about pretty much anything besides underage (high school implies the kids are underage), sex in the actual school (kind of), and copyrighted content, and bestiality (one can argue furry shit is that anyway).