This article isn't anything more than a rant. The author filed a bug in the QT issue tracker [1] that some proprietary screen reader (JAWS, that his customers use) does not work well with QT on Windows. No (technical) details provided whatsoever. I don't believe anyone in the QT team is /against/ stronger support for accessibility. IMO it is understandable that fixing some piece of proprietary software is not a top p…
It seems to me that you're just repeating the author's point, but with a different tone. Issues of "blame" aside (what does that even mean?), his point is that open source software tends not to meet the needs of the accessibility community. One possible cause of this is that the devs who support open source software tend not to be disabled and tend not to have experience or even access to things like screen readers.
I honestly don't know enough about the issue to know how true this might be, but just dismissing it as a rant, even if the word "rant" is correct in this case, doesn't address the underlying issues.
BTW, a quick google search suggests that JAWS is far and away the most popular screen reader for windows. If it's not a priority, then accessibility for windows isn't a priority either, which is exactly the author's point.