I'm betting it was from Mercurial and he didn't bother to roll over the history.
From the readme:
>sudo port install ninja ragel boost multimarkdown mercurial
Yes it says later that it's only for a the SCM library tests, but it is ported to Github. Why not test the SCM library with git if you were using that? Seems more likely that he used Hg and was testing with it as well.
If I were to release any of our internal code to be open source, I would do the same. Nobody really needs to know I get lazy on EVERY Friday afternoon and check everything in as WIP.
It does appear to be, because there's no history -- everything is "Initial commit".