I agree - but you do still need to know git. Which is the point of the article - what hackers need to know.

Fossil is used by SQLite (who created it) and until recently Mercurial was used by Facebook but that's about it.

Aside from Facebook and Google who have their own custom VCS's the only real games in town are Git and Perforce. Which is a bit of a shame because Git is really bad at some things. Especially large file support (hence Perforce continuing to exist), submodules, and partial clones.