No, it's not.
If there's an issue the only issue is people taking it the wrong way.
Spotify famously wrote a blog about "the Spotify model" on project management when years later they admitted it was just a blog and they barely used it. There were lots of large companies that took it like gospel.
Bun's rewrite is taken the wrong way just the same. It doesn't even measure existing bugs and then what additional bugs have been caused by the Rust change. Maybe it can't, so the whole "measure" is meaningless. "Passing all tests" is a measure of how many tests there are. Even 100% test coverage is known to not catch all REAL bugs.
Question: since the Bun Rust -> Zig PR got merged were there additional PRs / issues about Rust?
Answer: yes
Conclusion: no, it wasn't solved in 1 big PR in the original stated amount of time, the end.