Yes, completely and utterly unaware it was bugged when they cancelled an auction and the item they cancelled was still listed, 100% completely not at fault of the person.
Sure if they only had a couple of items listed, but I am telling you now the old motto is “Abuse early and abuse often” because generally Blizzard simply put a stop to these practices and than do nothing more.
This is the second time ever I have seen people get banned for something that ‘was not their fault’, the other time was during BFA when you could purposely bug out WQ’s on the last step and get the rewards, but it would not register as complete, so you could complete WQ’s an infinite number of times.
Infinite rep, gold, WF/TF items, and it’s the same here, people no doubt recognised they could list something, cancel and duplicate the items and would have 100% abused it because historically people don’t get slapped with a ban hammer since yeh, it’s not their fault for the bug, but it is their fault for abusing said bug.