I don't think it's quite fixed. And in fact, the situation is a bit strange.
I did some comparisons between versions .18, .19, and .20. These comparisons used all the same settings, using both the Tchackpoum and Crocell kits. (I know Tchackpoum is not an official Drumgizmo kit, but it's one of my faves.) Also, my tests focused only on the choking of the open/semi-open hihats when the hihat pedal is stomped. I don't use chokes for other cymbals.
0.9.18 - Both Crocell and Tchackpoum hihats work perfectly (but Tchack has a barely discernible delay in the choke - I wonder if the samples are just longer).
0.9.19 - Crocell hats are perfect, rather than broken as was supposed to be the case for version 0.9.19. Tchackpoum's choke is, as expected, totally broken.
0.9.20 - Crocell hat choke is now broken, rather than fixed. It's not as bad as the Tchackpoum hats on version 19, but there is a delay in the choke that is pretty noticeable. Oddly, the Tchackpoum chokes, while also and still broken, are less broken than they were on version 19.
So basically, whereas version 0.9.20 was supposed to fix broken chokes, it actually broke the Crocell hihat which previosuly worked well, and while it did improve the Tchackpoum hats, it didn't fix them. I performed my tests twice, so at least on my system, the above is an accurate comparison of the three versions.
I hope this info is in some way helpful.