Tags are locked to a specific commit. So you won’t be able to create a different release with the same tag. Even deleting the repo and creating a new one won’t allow you to reuse the same tag, unless you change the repo name.
Immutable releases include protection against repository resurrection attacks. Even if you delete a repository and create a new one with the same name, you cannot reuse tags that were associated with immutable releases in the original repository.
You have a higher chance of solving this issue if you ask in #webrtc:matrix.org