I think you misunderstood. In referring to "truth", I wasn't addressing the veracity of Watson's statements (which, however you come down on that, were objectively racist, in the sense of making judgments based on race). I was talking about his impropriety, the truth of which even TFA admits (even if it emphasizes his attempts to later "correct" the record). Watson used a colleague's work in a way that appears less than on-the-level. Watson misrepresented the events of the discovery in which he played a major part. That is what would lead a dispassionate observer, without bias, to reasonably question his statements, especially ones which we are expected to accept, in part, based on the strength of his record.
He was making a prediction of capability, based on attributes which he chose to couch in terms of race, and which have inconclusive applicability to the capability in question. Notably, those attributes are known to be affected by, as opposed to the cause of, the outcomes which that capability is supposed to effectuate.
