Jujutsu is a Git frontend, from what I understand, much like there's tons of Git GUIs. So, you interact with it in a different way, but you still push to a Git repository and others can interact with your code by using Git.

I guess, it somewhat lessens the grip of Git, because they can hook different backend services (e.g. Subversion, Mercurial, Fossil) into this frontend, and from what I understand, they plan to develop an own backend eventually. But yeah, for now, the communication standard is still Git.