Now that's just a ridiculous thing to say. It's all integrated, you can't really allocate any specific percentage of strikes to boxing/ MT/ etc.
Frank Edgar has developed a very slick kickboxing game, which implements alot of movement (with his feet & head), as well as strikes with all 8 points. You can't just say that he's 80% boxer, 20% Nak Muay. That's ludicrous.
Same with GSP, his striking game is very integrated into his whole MMA game, is very crisp and complements his grappling very well. He uses kicks, knees, elbows, & punches.
And if you think Semtex, Anderson, or Shogun are boxers then you're retarded. Shogun KO'd Lyoto with an overhand right he used to counter Lyoto's typical counter to his leg kicks. If that's pure boxing, then I don't know what is kickboxing.
I think you misunderstand what Muay Thai is- the art of striking with 8 points. Interestingly enough, 2 of those points are the fists. You don't have to TKO someone with leg kicks to be a MT stylist.