As recently as the first dot-com boom, Git didn't even exist. Even Subversion was brand new, and it was mind-blowing how much easier it was to work with than CVS.
One aspect of history that this article glosses over is that Git is not the only or even the first third-generation version control tool created. The earliest buzz I remember around DVCS was for darcs and bazaar, neither of which I've heard mentioned since about 2009. Mercurial and Git were released around the same time as one another, and were in a vim-emacs sort of grudge match for a few years before Git became the clear winner.
Mercurial seems to still be in use in some odd corners of both the corporate and open source worlds - probably a legacy of people choosing it for projects during that period before Git "won". When I first tried it it felt a lot like Subversion made distributed. Nowadays it feels incredibly clumsy next to Git.