[acous]

The article you cited describes games that feature 2d projection of artificial 3d movement that doesn't correspond with the signals coming in to our vestibular system. The same is even more true for VR experiences -- artificial movement that doesn't match what we feel causes nausea for many. The reason Valve can claim 0% sickness is that they're only talking about experiences that don't generate mixed signals, where the player's position in the real world matches 1:1 with the virtual perspective, so that sense mismatch sensation never has reason to trigger.