Well I know for a fact that the fellows played a lot of that rhythm with the quick sizzles and stops by doing it via choke cymbal, let go, then hold again,...
However yes, it certainly does sound like a sock setup.
I have several thicker 10 and 11" cymbals from that exact era and none get you that sound. I do have one very thin one from that era that's actually starting to bend a bit,... that's the one that gets me closest to that sound.
To be honest a lot of fellows in the mid to late 20s still were not that "into" the mid height sock cymbals just yet,... in fact Baby Dodds was simply not a fan of them at all,.. of course this is not Dodd's work on that track.... just for reference though.