Guess that locks it up. I've never had the problem myself, so I don't know other than what I've heard along the grapevine. I can understand why limp wristing an unlocked blowback could cause a failure to properly eject, but i don't know how that would work with a tilt barrel design. Not denying it mind you, I just don't know how it works.
The slide still has to rebound with enough force to fully extract the case, toss it out of the way, and move sufficiently back to pick up the next cartridge.
There is not a lot of extra energy to lose, as that batters the mechanics of the gun, so remove enough resistance and the slide doesn’t fully cycle. It really doesn’t matter whether it is blow back or delayed blow back.
I bet you can get whatever semi-auto you shoot to fail to cycle properly by very loosely holding it. It may not stove pipe, it may just fail to pick up another round.
Of course anything obstructing the slide would have the same effect, such as clothing, other hand, etc.