I cannot see why he should have any "secret" apart from the wig itself. He is a young guy, and he wears a high quality wig which presumably he has plenty of professional help to keep looking good. You never see his hairline, which is the only real point of vulnerability for a well-made well-colour-matched hairpiece. Why should there be any more to it than that? Loads of other guys on this forum are getting similarly impressive results, probably for a lot less money and with a lot less help.