that could very well be Bigbeard, but I will say the numbers that I've been in, i have yet to be in one that was 100% free from it. Yes, some are definitely less noticeable than others and more tolerable than others.
I have only been in one 2017 and it wasn't too bad so maybe they've quietly nailed down the issue. I have three family members that all have the extended version with one being a '17 denali (just picked it up 2wks ago) and I am interested to take it for a spin soon. The others are a 15 Escalade and 16 Yukon xl. Both exhibit the buffeting with the esky almost worse than the yukon. I've been in two rentals over the past year, both short versions, (15 and 16 yukon) and they both had it. Dealer loaned me a used 15 burb ltz with approx 20k miles on it and it was horrible (but yet they sold it just a few days after ). Neighbor has a 16 Tahoe LTZ and he kept telling me it's problem free but yet within 5min of driving I noticed it. It is not as bad as ours once was but I could feel it. Not to mention I've test driven several 15 and 16 yukons since owning ours as I was planning to trade ours in for a good one.
I know many others have experienced the same when test driving many many trucks. A few have had two buybacks and could never find one buffeting-free so they went with a different vehicle.
By the way out of many different ones, my wife only felt it in a couple of them so I t hink the level or issue does vary. She's hardly bothered or feels the pressure with ours which is the reason we still own it as it's her daily vehicle.
I've pretty much given up trying to resolve it or wait for GM to issue a fix. I just make sure the michelins are RF every so often and just deal with it.
.