Well he's claimed he is on factory skis (other than prototyping season) many times on his blog, TGR forums, twitter etc. I doubt he is lying.
Like I said, think about where you have seen him ski, in movies it is almost always in pow or soft smooth snow, and only the good looking shots make the movie. You don't see him skiing bumped up refrozen chunder at a resort do you? Also, he is one of the (if not the) smoothest big mountain skier in history, his balance, snow feel and air awareness are unparalleled, which is why he has been on top for so long.
When you back-slap/hip-check, your skis are not taking the full weight of your body, so why would you need a 2x4? If you watch big mountain comps in shitty conditions, you'll see that people on softer/rocker skis do have insane tip flap when they are skiing fast through shitty snow, but their balance and balls make up for it. 2x4's like the RC112, old Squads etc, are more predictable in those conditions, but also require more strength/stamina to control and are not as good in soft snow. It just depends where you ski the most.