Removing the abandoned tag after one update is a mistake. Any game that got the tag should have at least 2 timely updates for the removal, so that lazy garbage like this wouldn't fly.
Honestly, you could reasonably argue, that if a game receives even a single update...regardless of how small or minor an update it is, would by its own definition mean that a game is no longer abandoned.
As "Abandoned" does mean "no work being performed on the game at all".
A better choice would be to remove the abandoned tag, but also place a note on the game's front page that says that the game previously was abandoned, and updates only recently restarted. Add in a cautionary note to potential downloaders regarding the previous abandonment.