I guess it's just coming down to who's theory you subscribe to? Graham Hancock has separated himself a lot from the "mainstream" archeologists and gotten a lot of hate over the years. I haven't seen "Ancient Apocalypse: Americas" yet though and I don't know anything about archeology myself so I have no idea who might be right or wrong.
Discussion
I haven’t written him off as wrong or anything but so far the connections he attempts to make are very weak. Played up by a lot of showmanship. If he discovers something truly new … great!