"which doesn't say anything about interest in long term relationships."

We're talking about Tinder. While longterm relationships do come out of that platform, it was intended and still used primarily as a hookup site. I'm not sure how the authors think Tinder is a good platform for longterm relationships.

I would guess if you looked at the highly desirable men, the numbers would show they are also more selective. If you can be successful with the population of more desirable mates, why not be lazy and ignore the mid/lower tiers of mates? That's essentially what we see with most women.