They dont, and if they did there'd be a nonstop wave of criticism - which might be why they dont.This isn't actually a good defense, presumably, the developer wants us to become Patreons and that isn't going to happen if they choose to make poor decisions. So arguing that only Patreons should criticize the game isn't actually good for the dev(s).
That said, your suggestion to post about it on his Patreon is actually a good idea. If they allow non-patreons to post I might consider doing it.