To me this seems like an odd preoccupation for an article that is very little about the Bun rewrite as a running program and very much about the process of the re-write and how it came to be in commits to the repository.

You could argue that the release tag isn't important - but at the top of this comment thread a member of the team confirms they delayed the release to finish some extra testing. So the ambiguity around if the project is complete and pointing to the lack of a release mirrors internal sentiment as well.