For a scientist to say "there is no doubt" requires a higher level of proof than a bit of hearsay and some personal feelings.
I've read the full transcript of one interview with him and he justifies some of his statements by saying things like "I don't believe LA is that tall, he's 5'6" at the most".
Erm, how about going from measurements? Besides, 5'6" is very short for a man, so if LA was that height it would be very obvious in photos.
Nope, I don't have any respect for this guy. He may be right, but to me he comes across as a publicity-seeker, not a professional.