If I did a post that said "geez you guys, don't you know that there were no medieval kingdoms that were Nazi Regimes? WHY do you keep making them that way??", then it is fair to say I'm setting up Control of Language in the assumption that is meant to make anyone who likes or designs fantasy kingdoms to seem like a Nazi-lover.
That's exactly what this tweet does. It leaves the options available (if you're stupid enough to fall for the Foucaultian control of language) to "Yes they were ethnostates", "i'm sorry for creating/liking ethnostates", "I also hate all fantasy settings for being ethnostates!" or "fuck you I love ethnostates". No matter what, the point is that anyone who responds to her with other than "yeah, down with settings based on reality!! Seattle2020Realms 4 evah" is going to by default be labelable as pro-ethnostate.