Gsync has been working fine for me. Sure it's not a bunk driver install or something?
Definitely sure, I did a clean driver install using DDU when trying to fix it. It occurred on my old 970 and my new 980ti. I could reliably avoid crashes when booting the game by alt entering during boot, which caused it to switch to windowed mode. Then others posted similar symptoms and we realized g sync was the culprit. Not always, it used to work without issues but some patch about six months or a year ago or something stuffed it up, either that or a new set of Nvid drivers in that same time period, or combination thereof.
All crashes stopped when I manually told Nvid control pannel to not use G-sync on CoH2.exe. Prior to this, it crashes at a rate of nearly 100% unless I did the alt+enter trick - which worked because G-sync does not apply to windowed programs, only to fullscreen ones. The problem occurred during boot, not during gameplay, so you could go fullscreen again once you booted up. We reported the problem but no idea if it got fixed.
Not sure why you are unaffected, but there were multiple other G-sync users in the same boat as me based on postings in the bug reporting section.