The article has quite a bit of "me, me, me, I, I, I" self-promotional content. Which makes sense given it is an advertisement for his book.

I find it jarring to hear that authentication is "largely solved" by passkeys and FIDO, technology that a very very small minority of applications support. Making claims like this combined with the focus on self-promotion is a quick path to being dismissed and ignored.

Agreed, this is like the lead the horse to water issue. Yes the water exists, no one is really drinking it yet.