Some of this entirely accurate, but some of it is unfortunately too stupid to take seriously.
If you want to blame Lennon for dressing like a teddy-boy, you have to blame every single person in the history of the human race who emulated their idols superficially. To say nothing of the fact that Lennon's emulation was by no means superficial; he was extremely well-versed in '50s rock and roll, folk, country and rockabilly. Nothing poser about that.