If I remember correctly, motion sickness happens when the motion does not match the view. For example, boats move, but the ocean / boat does not appear to = motion sickness. Same with some XR headsets, the lag between moving and having the display match the change can be enough to induce motion sickness.
I believe having a dedicated processor for sensors and the M2 for updates on the AVP will probably eliminate much of the lag created by older processors (Snapdragon XR2).
Brownlee has a great review: