They have way more canons with more men than women, even in those genres, sadly. The "odds of zeitgeist" part applies to fandoms as much as pairings. (And when I've tried to run the numbers on some fandoms I love that I thought of as female-character-heavy, a lot of them turned out to still be majority male, because we've all been trained to think of 1/3 women as a lot, or two women leads with a mostly-male supporting cast. Even one more male than female on the main cast multiplies the possible m/m ships considerably.)

But yeah, of course there's misogyny in what canons and ships fandom gloms onto! There's misogyny everywhere as people have been saying up and down this thread. The simple numerical correlation working out is super interesting though and I think even the people who did it expected it to disprove the argument.