This may just be due to unfortunate phrasing, but is it really rare? In this case the roles are adviser-student, and at least anecdotally it doesn’t seem that rare for an adviser-student relationship to be a female-in-power one. We just don’t hear often about abuse in such relationships—likely because it doesn’t happen as much.
(If you meant that it’s rare for the woman to be in a position of power in #metoo cases then I’d not disagree, otherwise I find that specific statement surprising and possibly misrepresenting reality in an unfortunate way.)
That aside, I’m mostly in agreement with the sentiment.