Problem: we now have at least two questions1 about the Beluga XL (the original Beluga's intended successor), which is derived from the A330, not the A300, making airbus-a300-beluga an obviously-inaccurate tag (due to the "A300" contained in the tag name) for these questions. However, the Beluga XL's configuration, mission, etc., are so similar to those of the original Beluga that it doesn't really make sense to have two separate tags for the two; in fact, the Beluga XL is itself mentioned (and briefly described, and its Wikipedia article linked to), for completeness's sake, in the tagwiki for the aforementioned tag.
As such, we have a situation where the aircraft forming the subject of these questions is covered by (and described in the tagwiki of) a tag that, due solely to its name, cannot actually be used on these questions. Renaming said tag to simply airbus-beluga would allow it to be used for questions concerning the Beluga XL, without introducing any significant amount of ambiguity in the process.
1: Plus a third that explicitly concerns both the original Beluga and the XL.