(On the other hand, I highly suspect that you yourself have "other" reasons to cast doubt on Bray's claims. I have as much reason to doubt your motives as you do to doubt Bray's, right?)
And you can say "guess" all you want. There was nothing in his post, or any other article I know of, that indicates Bray's motives were anything other than what he said (and backed up with extensive supporting evidence). So your motivation to "guess" doesn't come from the article itself, nor from any competing evidence (which I doubt exists since you would've already posted it).
"I don't mean to specifically call out kjgkjhfkjf, but my guess is that he feels compelled to downplay legitimate criticisms of Amazon, and he used the well-known techniques of ad-hominem and FUD as a means to defend Amazon without actual compelling counterarguments." <- I assume you agree with that sentence, since it uses all of your same rhetorical techniques.