I think he was talking about that both Mudbone and Dennis Chambers played drums on Atomic Dog. But yeah that story you mention is a classic. 
I had to go back and listen to it again. GC also talked about that they rehearsed a 3GP show just before covid hit. I suppose they wanted to have some 3GP shows around the same time as they were going to release that 3GP bangers 12". It was also interesting to here about how he sang on Summer Swim over the cell phone…