Right, by design. But when your are talking about the phenomenon casually, because the purpose and result is the same, shrinkflation seems to suffice. Are you asking for the name of the phenomena in the context of a detailed study? For that i am not sure it has a term it’s own.
Almost, but would be funny is if instead of Bane, a female supervillain wearing the pocketed vest. When Batman asks, an annoyed supervillain points out that all the pockets are fake.