Early production 2020 ST, Nov 19 (I think, I can go look if you want), 19,xxx miles, we have had it two years (got it June 2020, but bought it from a dealer who's GM used it for 5 months and it had 8,xxx miles on it when we got it).
Not sure about how many bolts are under there at the problem area.
Zero problems with the butt-end of the vehicle. Or anywhere else really.....