It's a joke basically saying "First, there was B, and it looked like this. Then, there was C, and it looked like this. Finally, there was Go, a new evolution of our work".

The git dates were clearly faked and created entirely for the purpose of this joke.

If you wanna know how to edit dates, this blog does a slightly better job than the `git-commit` man page: https://alexpeattie.com/blog/working-with-dates-in-git#chang...