Had the same vibration issues. I'm on my second GV80. So far so good, rounding 8000km now.
My first GV80 was a complete dud from temperature sensors going bad, steering feel driving all over the road, vibration issues, electronic issues with center screen turning off and the power window on passenger side wouldn't roll up randomly, topped off with a bad battery/drain issue. I ditched it for a quick loss of ~$8000 at ~9000km. Not a great experience. The first GV80 was manufactured October of 2020, sold to me in January 2021.
Since my first GV80 rolled off the lot it just drove different and coming from a 10th gen civic that drove solid I was like this is not ok for a $70k(CAD) vehicle. The vehicle started in the service department at 1000km for the steering issue/vibration issue and then bad balanced wheel weights, then electronic gremlins, then very harsh vibrations around 4500km(was at dealer for new driveshalf for over 30 days). Once I got the vehicle back after the driveshalf was replaced, it drove smoother but not totally eliminated. So I just tried to push it to the back of my mind, until the battery issue started and I was just like I'm done with this vehicle. A little back and forth with the dealer and got a decent price for it but still slapped by depreciation.
As I was only going to get a good buy back value from the Genesis dealer I bit the bullet on another GV80 as I do love the looks and the demo vehicle drive feel was nice as to why I bought one in the first place. My second GV80 was manufactured in late April of 2021 and it has been pretty solid. Aside from some hiccups here and there expected for a first year but boy Genesis must have had some QA issues in those first production months. My second GV80 still suffers from slight vibrations, it is a trim without adaptive dampeners so I do find the suspension a little harsh and you feel road vibrations, but nothing like my first GV80 and it's acceptable for now but I am keeping my eye on it.
Sorry for the long post. Hopefully my story helps to show you are not the only one in this spot. I just hope where you are has Lemon law because my home province did not.