AFAIK, the standard rule is that the tag gets applied if the dev has not provided a written update on any platform - meaning here, discord, patreon, or any other site - for a certain amount of time.
The dev does not even need to be posting here, if someone else is porting their posts from Patreon, discord, etc.
I do not know the specifics for that game attaining the tag, but it
is marked as Abandoned, as you say.
Perhaps, with that one, the dev had a quiet period & it got the tag, then he became active again. IDK.
In contrast, this game is
not marked as Abandoned. Dev provides written updates reasonably frequently. Last post here was less than a month ago.
Meaning it was obviously a redundant question.