As far as I can tell, the content of your first comment in this thread was
> The site is the work of a guy, "him", and "his" work. We don't have to guess and say "them" and "their" work.
This, to me, indicates that you want the previous person to say "him" and "his" where they said "them" and "their". Even in this post you're displaying a negative opinion about the use of singular "they", and expressing that you want others to stop using singular "they" this way. Am I wrong?
Like, if you referred to Dominique McLean with "he", and someone said to you "We know that person prefers they/them pronouns, we don't have to guess based on appearances and say 'he'," would you not characterize them as dictating that you have to use certain language?
> I don't speak in vagaries when something is specific and known.
I hope you do. (And I'm pretty sure you do.) Omitting information that is specific, known, and irrelevant is a basic part of communicating well. Not every failure to bring up something that is specific and known constitutes "dumbing down of discourse".