I found this article interesting, but surely there is some kind of deliberate provocation in an author posting in an anonymous blog with a weird name and no bio covering a grab-bag of subjects - warning against casual polymaths? I kept waiting for the "but".
I also noticed there seemed to be a bit of cognitive dissonance in this fact. I started reading the other posts and it appears the writer is doing the same thing he is railing against. On top of that, the writer does not have any identifying info about their domain expertise. That being said, still found it an interesting read.