You need to make a way for an author/maintainer to be able to remove the Abandoned flag from their own addons.
Perhaps when a new build is created, it should be removed. Or even a checkbox to uncheck on the project page.
But having people try to figure out how to get the flag removed, and then trying to track down the mod whos on duty who can do it, is kinda dumb when they automatically fix it without question. Its just more hassle for authors, and another thing for mods to do which they shouldn't need to.