Sorry to hear about your bad experience! Hopefully it's the last one for the near future. From the few times I've had similar situations, I've discovered there are different departments at Airbnb that handle different matters. For example, when I've had to go to the resolution center, there have been two separate agents who are handling the claim. One 'team' specializes in one area that the other doesn't.
So in your case, it seems like there was a second team following up on your review response that likely works independent on the agents you had been talking to. Yes, they should look at the notes, and they may, but it seems like they want to build out the case with their own fact-finding. I try my best to answer them with a smile because I know they're doing their best to support me as a host.
Hope that helps and fingers crossed you don't have any more headaches!