Honestly when I first read the screencapped post I was just thinking the whole time, "You know, this tradwife shit would be a lot more bearable if you just prefaced it with the words, 'this is just what I get off to'", because yeah, like you say it is pretty darn obvious that this is in fact a fetish thing. It's really the pretense of sincerity that makes stuff like this go from Problematic to Harmful.