See the text of the comment: "12/12/91". The `git blame` is likely due to not having imported the previous history as commits when the original import to the git repo happened. I worked at a company that moved from VSS to TFS for a ~10 year code base. It took months for the consultants to get the import to preserve the history. Too bad this didn't happen in this repo.

edit: Found this [0]

  Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it.

  Let it rip!

0: https://github.com/torvalds/linux/commit/1da177e4c3f41524e88...

That commit seems to include all the code written before 2005. The commit message notes that it doesn't bother including the full history.

The comment says 12/12/91