He's either overstating the case (Vive does have better tracking which helps) or maybe he's comparing different experiences. The real differentiator is what you're doing. On a proper setup, people don't get sick playing roomscale Vive games. That is true, and true for probably a hundred people I've had try my Vive. However, you can get people sick immediately with artificial movement, and especially artificial rotation. Quite often at the end of my demos, I'll see if people want to try feeling sick, and we'll pull out Fancy Skiing or something - and almost everyone gets queasy the first time.
So yeah, if he's showing people Job Simulator on Vive, and some flying game on Oculus, he probably isn't lying, but he's coming to the wrong conclusion.