You really have a recoil issue with an AR in .223?
Reducing cyclic rates on a Class III device does have merit wrt accuracy (which is what the devices you linked to are designed to do, while simultaneously lengthening the recoil impulse) - but in a semi-automatic what’s the point?
If recoil is really causing an accuracy issue when shooting an AR - I’d suggest in order of expense: a directional muzzle brake on your existing bbl.; a smaller caliber upper i.e. a .22LR upper from a reliable manufacturer, lastly an HBAR 20” upper in .223.
It’s your money - spend it how you wish.
All-
My friend is a professional war fighter.
I am not.
HE says the recoil reduction is worth it.
He and his teams use pretty much every rifle pistol and automatic in the armory. Every week. I’ll respect your opinions but go with his.
Perhaps you are more manly than he and i are. So be it.