Every point in that post has been discussed at length other places, some of which is in the HN thread the author mentions. And the discussions make it clear that the points being made are not seeing the problem - not that there isn't a problem.

Passkeys have benefits - but they also have problems. Many people just don't think the benefits are worth the problems. And many people are afraid that sites will just stop accepting passwords in favor of passkeys, leaving people worse off.