I'd say there's a better chance of Mensah just not having game speed compared to work out speed. It was painfully obvious he was slow on the field. No burst, no accleration, no top end speed. I can't see any way he makes a roster, even as a practice squad player.
It seemed something wasn't right with Mensah in 2021. Look at his stats over the years:
2017: 561 yards rushing, 4.5 YPC, 4 TDs
2018: 1045 yards rushing, 4.6 YPC, 6 TDs
2019: 1013 yards rushing, 4.5 YPC, 9 TDs
2021: 314 yards rushing, 3.0 YPC, 0 TDs
I hope he gets a look from somebody.