You are not wrong.
However, at this time, these muzzle devices are not suppressors.
They, like all things, could easily be made contraband.
But that is future We’s problem. Buying and enjoying enhanced muzzle and recoil control devices, or not, based on what might happen in the future, or not, is a sorrowful way to live.
Carpe diem.
Here’s an article you may enjoy, Al.
https://www.ballisticmag.com/6-of-the-best-muzzle-blast-control-devices-available/