They accuse the algorithm of perpetuating gender stereotypes, but it's really society that's doing that. The ads are just trying to be the most efficient and in doing so they mirror the preferences of society. I don't know why anybody ever assumed that professions would ideally be 50-50 by gender, but that does seem to be something that people come into these arguments assuming.
Put another way, what's the conversion rate shear between mechanic job listings between women and men?
Overall, agree with your take.