An "immutable hole" just sounds like a "revocation marker" without an accompanying message, so I don't think we're really asking for different things, here. Nevertheless, ordinary tag deletion -- what git natively supports -- can't be supported directly.
The difference is the unavailability of content. For example, you attach the wrong binary and want to avoid confusion/mistaken downloads either manual or via tools that don't support your markers, in the most direct way - by deleting the binary from release.
But you can't fix it if you opted into the security benefits of no hidden mutation
