A Kubernetes tool coined the term but it’s always been about using git to store your manifests for your infrastructure, with some method of synchronization between the current state and what is in the git repo. With that in mind, it makes no sense to call them synonymous, GitOps transcends the concept of a particular tool or ecosystem.
It definitely correlates with Kubernetes pretty well. I read the title and already had a good sense of what the project is about and found the title accurate after reading more.
I disagree on the basis that managing kubernetes deployments isn’t necessarily done in a GitOps fashion. You have to elect to. You might manage your deployments with manifests that you don’t store in git at all, with no automation to synchronize your git repository state to cluster state. You might opt to manage your cluster in a ClickOps fashion with one of the many GUI tools available for doing so. Kubernetes can be managed in a GitOps fashion, but you have to elect to do so. And in that way I don’t see how anybody could say they correlate.