Ugh to answer the last line of the author: I have been using them for that long and the up and downsides are very well known to me. He has an subjective opinion about them, states them as facts 'and everyone who thinks differently is just stupid' OK author...
A self-published eBook that acknowledges a lack of funding on the main page?
Maybe it is required reading in typography circles, but to someone reading the submission who merely uses a font, this doesn't seem much of a credential.
I'm not meaning to deal any blows at all, low or otherwise.
I'm merely explaining that to the reader not a student of typography, there's not really any indication that this should be taken with more authority than 'some blog author' per comments above.
From a brief bit of clicking around, the author has: designed several typefaces[1], written a long text on typography[cited previously], and has done enough programming to have developed the publishing framework he uses in his books[2], and to have written another book on a programming topic[3].
While I don't agree with much of this blog post, I certainly think the author has put in enough work to have their work taken seriously in this particular domain, and generally seems like a pretty interesting person.
I'll state just once more, in order to be absolutely clear that I harbour no ill intent: I have no reason to doubt, having been told, that the author can be regarded an authority on the matter. I'm simply saying that, approaching it fresh, it's not obviously the case, and other commenters' disregard should not be treated as that for a household name.