I don’t quite follow that statement.
Since the same force be it the round firing with the lock or without the lock stopping the slide it’s the same impulse on the gun and the hand ether way. The only difference would be the action of the slide going into battery
Have you ever compared the recoil of a pneumatic air rifle to a spring piston air rifle? The recoil of the pneumatic is almost non existant, there is so little momentum in that 8 grain pellet but the recoil of the springer is quite noticeable even though the pellet momentum is comparable. That recoil comes from the piston accelerating and then slamming to a stop.
My semi auto .22 pistol has a much different recoil feel than my .22 revolver due to the slide slamming back and then forward.