My take is that while this movie does collect all the permanent items and upgrades, which could lead to the 100% movie class, it aims for more stuff beyond this movie class. It also gets the best ending, which is a different movie class, and it also aims for full map, which we don't have a movie class for, and we haven't ever considered such a goal a part of full completion.
If we want "100% map" (or something along these lines) to be considered a part of the full completion goal for a game, we need it to originate from the game recognizing this goal as a part of full completion.
In Super Metroid, "100% map" is not a part of full completion. We limit full completion there to just "all items", and this is what the game cares about, awarding you with a 100% screen, which officially states that you've collected them all.
If for this game we can agree that everything this movie does can be clearly checked in-game as N out of N, then the game does recognize our completion in all these aspects. If some of them the game doesn't care about, we can't say they clearly and officially belong to full completion.
If a game explicitly encourages you to complete N out of N something, it's an easy case, the most obvious, official definition for such a game. If the game just recognizes fullness of something, it is also easy, like "all levels" in SMA4 (don't remember if the game encourages that). But in SMB3, the game doesn't recognize your "all levels" goal, so
we decided not to call it full completion for SMB3.
In cases where nothing is encouraged or recognized by the game as possible to complete fully, there's no clear and obvious way to define full completion. If my information about this game is correct, this movie does some things beyond clear and obvious, vaultable full completion. If so, it's unvaultable.
Since the game does not have any percentage counter, we can't use N%, which is exactly
what the publisher guidelines say (agreed by Nach). In such cases we use "all X". But yet again, this run aims for more than just "all X". It aims for "all X, all Y, all Z", and some of these were decided by me (with the information I had) as not parts of the vaultable full completion goal.
If we agree that it's not vaultable, we need to come up with a label that reflects the goals the most accurately, if possible. So we just have to agree on something. I'm open for discussion.