Firstly, I would point out that it's a label, not a tag. A lot of people (including a1fox3) use the wrong term. Normally I don't think it matters that much, but in discussions like this specifically, it gets confusing when you misname things.
Now, to your question: I agree with you that this happens. However, F95 has rules that I think should be followed. I don't always agree with the rules (like in this case), but if the rules get consistently followed (spoiler: they don't), people would have a much better understanding of why things happen.
It's the same for tags in a game (not only for labels). If something is tagged as netorare but that hasn't been added to a game yet, it's misleading b/c someone expects the content to be there. Yet, there are some who say that should be applied because it will be there. So who is right? A rule has to be created and adhered to so people understand what's being said. So as a1fox3 said, the point of the Abandoned label is to flag that at present no progress on the game should be expected currently.
This game is a special case ofc, because WPG has said multiple times (and just reiterated above) that this is not actually abandoned. But when 90+% of games that get the label are, in fact, abandoned, it's better to err on the side of caution and occasionally mislabel stuff. It's an imperfect system, and I definitely don't always agree with specific standards that have been laid down for this type of stuff. But I do think that without any specifics it makes it a lot harder for people on the site to make any determination about games to support, etc.
So I disagree with the implication as a consequence of following the site guidelines, but I do agree with the guidelines themselves and with following them when they apply, even if it results in something unfortunate like what's happened here.