I'm not a programmer, so my view may be a little bit skewed.. but this seems like a list of things that may or may not be correct (and I'd like to put things in a continuum, or percentages, or some other more practically observable other than a list) but it doesn't really get any further than that. How substantial many of the claims are?

I honestly doubt "programmers" get all these wrong. I'm not going to link to a post (I've seen some people replying with a post as if it's a substitute for actually saying what's wrong) or even say that "programmers" is a group too big and perhaps too inclusive to really have anything to say about them. I'll just link to esr's guide on hacking and ask the people who wrote the articles who they were dealing with. I doubt that the "hackers" being talked at esr's guide would do a thing like that. I'd also like to link to the suckless philosophy and ask if the "programmers" and software the writers were dealing with were really what what the suckless philosophy is completely at odds with.