"my prev employer reverted some HSA contributions due to an accounting error. " - ah, that makes things a lot clearer.
"However, they reverted in the contributions in 2020, making it look like excess contrib was withdrawn in 2020" Yes, well, the excess was withdrawn in 2020 ;-). This timeframe seems perfectly normal.
I am sorry that I can't yet satisfactorily answer your original question, but I suspect that this message - which I don't recall ever seeing before - has been recently added, and I haven't yet figured out what it is intended for. However, it seems that your return is probably correct, so hopefully all's well that ends well...
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