Steam becoming a complete shithole if your reviews can be deleted for being negative, letting a scammer like this get away with scamming. Also a joke that a barely started project like this crappy game can be released as a "game" (even episodic). Seems like there will be no minimum standards whatsoever in the future.
Well, seeing his negative reviews not been removed. Not sure that is necessary true. But a review need to be about the actual game, if all you do is lash out on the creator for being a scumbag, or whatever. There is a good chance it will be removed, but so would be the case for any other games.
As for being "banned" for posting certain stuff in the discussion group, that is to be expected on steam. Language that fly in this thread, won't necessary fly very well over on the steam platform. If you want to throw critics at a dev and their game, you need to be smart about it, not come across as a douche. If you end up get banned, and contact steam support for help, they would consider the language you been using causing it. Doesn't matter if you are right, if you carry yourself as a bumhole.