I'm not sure if you're describing what I would call lugging. In my 2020, I find that in first or second gear, easing off the gas, dropping the revs far enough, followed by acceleration will produce the lug as in a manual trans when you let the revs drop too low for the gear. Others have described it as such. Some describe a jolt. Well, if you're lugging and then give it the gas there is a somewhat jolting sensation as you might expect. Some describe shifting issues in other ways.
It's easy to call this a CD issue but I view it more as systemic. You could just as easily say if they had put in an 8-speed tranny they could have smoothed things out. You can't take CD out and you can't put an 8-speed in, so what to do?
Whether somebody experiences this lug would depend on driving style and situation. Your sales guy has a point. If you're frisky with the gas into 3rd. gear you get a sporty-ish engine growl and smooth shifting. If you use sport mode that revs higher you're also not likely to experience the lug, though I don't consider that very friendly in daily driving. I've gotten accustomed to being more frisky on the get-off so it does not bother me that much. Still, if I'm in a low gear and then have to ease for a slow moving car in front, or ease off into a turn and accelerate out of it, if the revs drop low enough it can lug. The more I drive it the more I know what it wants in these situations. I'm getting the hang of what it wants in a hairpin turn I come up on with some frequency; how I work the gas needs to be just right to get through it smoothly.
There is a TSB 05-002/20 entitled "Surging at Low Speeds During Acceleration" when locked up in first gear, last updated 12/18/2020 calling for a software update that will adjust control of the torque converter. That was posted in another thread and I only have the hard copy, so I'd have to hunt for a link. The 2021 was not addressed in this TSB but who knows if it will be updated again. I've skimmed through the other 2020 TSBs and this is the only one vaguely related.
I'm going for my first oil change soon and I'm going to ask about this TSB even though it does not appear to apply to my experience given the description. Unless the dealer can say, "Oh, yes, we have experience with this eliminating some lugging," I'll take a pass under the heading of "unanticipated consequences".
In the end, it may just be what the salesman said--it wants zoom zoom.