Not exactly sure; but I believe @Thomcat
has found a way to pull a fuse, to temporarily shut down the ANC system?
The hyperlinked article indicated that disabling the ANC (pulling the RDO fuse) was the first thing that was done and it didn't make a difference, but a good start.
Carsickness is nothing new to adults, children or pets. Usually the result of second row seating directly above the rear axle, although in the Suburban, just as with the '18+ Traverse, the second row seating is forward of the rear axle. Our old Trailblazer second row seating riders would get a little queasy on long trips which I attributed to getting constantly "humped" by the rear axle motion.
The "buffeting" noise in the article is atypical and nothing an ANC can compensate for since it appears to be pressure related. Some people will be more susceptible than this than others. Looks like the dealer in the article is pi$$ing away money trying to fix it without using a rational approach. First thing that I'd do is to place a carbon monoxide detector and manometer for measuring air pressure in the closed vehicle, remove any roof rack crossbars and then take it for a ride. If CO intrusion and poisoning is causing the nausea it will show on the detector. Variations in pressure caused by poor sealing of the hatch, windows, doors or firewall or defective HVAC seals will show as fluctuations on the manometer. If they're OK then the problem is noise not air pressure related and next steps progressively are to check the rubber seal on the leading edge of the hood for tightness, the underbelly to assure any skid plates and air trim tabs weren't removed and chucked during the last oil change, fold the mirrors, disable the aero shutters in the open position, place easily removable painters masking tape over the front windshield seals, especially in the bottom corners where there are two shaped plastic deflectors (if these deflectors are loose or missing, there will be noise!) and in a last desperation cross rotate the tires and retry. Good luck because I doubt the dealer will take this approach.
All that being said - on occasion I will get that exact "buffeting" sound, unrelated to this complaint?, coming through the speakers in the Bose system.....more to do with the cheapo front end on the radio but might be aggravated by the ANC function.....only get the noise on two stations and the buffeting noise sounds exactly like what I used to get on my ham radio requiring use of a BFO (beat frequency oscillating) knob to quiet.