I can't imagine that a book written by a misogynistic author with explicit themes of female submission to male authority obtained by use or threats of physical violence would be particularly appealing to women in general

Are you familiar with romance novels? Which gender do you think is reading stuff like https://www.amazon.com/Morning-Glory-Milking-Cambric-Creek-e...

Note the phrase “sweet and steamy” from the subtitle of the very book you link. Tyrant had sexual content, yes - sweetness, steaminess and romance? Not really

Edit: the subtext I’m speaking of is of submission and domination through implicit or explicit coercion. I’m not speaking of sub/dom with connotations of mutual enjoyment and consent, as can be the case in real or fictional situations of romance in general or even specific kinks like BDSM. I may be called sexist for this but my perception is that women can and do enjoy the latter (as the popularity of books like you linked imply) and greatly dislike the former