I want to preface, that I do not agree with the commenter. I don't think they should have even made that post, but that's just my opinion. However, the bigotry topic aside, I find it concerning for that page to even be in there at all. I'm pretty sure that you can't legally prevent someone from playing a game (even in video games, a person can just create a new account), especially a tabletop game played solo in one's own home. So even if that page is on there, I don't think it's enforcable, at least from a strictly legal stance. (I'll P.S. that I'm most familiar with Canadian Law, but a 5 minute cursory research period has led me to this conclusion)
I want to clarify that the purpose of that page is not to establish a binding legal contract. Clearly, it's not enforceable. I'm not going to take legal action against anyone.
The point of that page (as it states) is to make it bold and clear that if you agree or support bigotry in any form, I don't want you to play my game. And furthermore, it's not the game for you. That's all~