Some airports require airlines to continue to use their spots or they will lose them. It's possible that the flight is still flying, but not taking passengers. So they may say it's grounded even if there is still physically a plane flying around empty.
I know Heathrow was making airlines do this early on during all of this. I don't know if they still are, or if other airports were/are doing this, but it's possible that is what is going on.
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