I believe you're absolutely correct to criticize and point out that this would be a much better article if it were written by a woman. With that being said, there's probably a decent number of people who might pay it more credence because it's written by a man. If the goal was to appeal to the very people who probably need to be educated the most, it could have been helpful to include quotes by women or to have made it clear that women were consulted when this was written (I'm making an educated guess that this was the case here, but it's entirely possible this is not true).
It is clear, however, as you read through the article that there's a significant amount of bias and that perhaps not all that many women were consulted. Either that or they wrote some of these sentences with hyperbole in mind, to make it more palatable or easy to understand for the men who need this education. It was a bit disappointing to see them unintentionally reinforcing beauty norms, for example, when they make statements such as
She doesn’t typically consider what men actually find attractive or she misunderstands it completely.
I hope, however naively, that this kind of article does appeal to and helps to slowly shift the minds of those who need it most - men who are unintentionally or ignorantly sexist or are struggling with dating due to cultural norms they haven't deconstructed yet.