Sorry, it looked to me as if he supported those views. You are right, if it not consistent with other known copies its validity would be in serious doubt.
The only analysis he, and I, could do is what we observe from the picture. To get much beyond that would take expert analysis (have no idea what his level of expertise is) of the original document (paper, type, & indication of alteration).
It would seem, to me at least, to be silly to go to that much trouble (especially since the document in question doesnt seem to be readily available) when other avenues, that would remove all doubt, are readily available... Or at least should be.
The best way to get this all sorted out is to get it into court and see who has what
BTW in the best world this is a fake but causes 0 to do something stupid or actually tell the truth. I do not care which he does. I just want the law to be followed. IF he was adopted then I see very little possibility that he can actually maintain NBC status.