I'm afraid I must apologize for failing to make myself clear: it's that his practices call into question his statements in other areas.

I have to confess that I don't have specific instances at hand, for two reasons. One is that much of his more technical writing on programming is outside my own area of expertise. The other is that, given his tendencies, I largely ignore him.

My point, however, wasn't where he is specifically mistaken, but why the traits he exhibits in his rantings on other topics do have a bearing on his engineering judgement.

I do hope that's clear now.