I don’t think JOS has ever stated that he is JFK jr. He may have even said he is not, as I recall. Certainly at least 1 maybe 2 interviewers recently have introduced him as stating definitively that he is NOT JFK jr.
Not sure where you are getting the pretender vibe. Previously I have stated that others have thought he may be JFK jr. I was on the fence a year or 2 ago, but now think he is not JFK jr.
Any time I have heard JOS asked about JFK, Jr., he has deflected and changed the subject.
He is not him. The voice and looks are not a match.