Not wrong, just possessed of an opinion, a belief system, that self-justifies his own rationalizations. No different than an entrenched political or religious belief system, and no point in discussing it with him further, based on the obviously subjective position that witness reports are universally fallible.
What bugs us is the casual arrogance toward witnesses that is integral to the opinion.
As we stir this pot once again, we have to consider that the attention bestowed fuels the process, and thus perpetuates it.
In my opinion, and this is just my opinion, no more valid than his own, it's better to simply say, "yeah, yeah, there you go again, we heard your opinion the hundredth time, so let's return to the substantive discussion", rather than make this thread, or any other, once again about his opinion rather than about the original post.
His consensus is not required to advance discussion.