@Daniel7132
Thank you. Yes, I believe it's a technical issue but my worry is that Airbnb CS will somehow mess up the refund. They have already made a lot of mistakes with other bookings that did not fall under COVID-19. I think they are often panicking rather than checking policy and doing things correctly.
What I meant RE your host is, you mentioned that he had voluntarily refunded you for the second month (the month you were being overcharged). Seeing that Airbnb has since refunded you the entire amount, will your host get back the extra money he refunded you? If that amount was deducted from your final refund, it doesn't matter, but if it wasn't, he may have been left seriously out of pocket by trying to do the right thing.
You say that as far as you are concerned, your issue has been resolved, but it would be kind of you to check with him if you are unsure of the above, seeing as he tried to help.