One of the first things I did was loosen the axle pinch bolts, loosen the axle itself, then sat on the bike and rocked on it front to rear then put it back up on a lift and retightened everything in the correct order.I wonder if the front axle is not completely true on these early 2020's? This could possibly cause the front wheel alignment to be off center enough to make the bike pull to the left slowly. Maybe check that front axle trueness. Or replace it with a 2018-19 axle and see what happens.
BTW when you install the front wheel, there is a proper procedure and order in the tightening of the pinch bolts, loading the front axle/wheel before tightening, etc. So maybe first, remove front wheel and axle. Check for true. If all checks out, reinstall front wheel carefully according to the Service Manual. If it still pulls left, check rear axle. But only check each end one at a time.
In my opinion, there is no way that the factory randomly screwed something together wrong on all the bikes being reported on in this thread. The exhaust is such a logical change to the bike, and I did see a very noticeable difference when I took mine off that I feel certain that is the problem.
I’m no genious, and I’ve been wrong an awful lot in my life. But this just seems too obvious. I would love to take it off and run it for a full day with it off to be sure. But I don’t think it’s in my best interest to do that. I’m not unhappy about this, just a wee bit obsessed with proving my theory.