Interesting. I have only ever heard "gitflow" used to refer to the specific model described in https://nvie.com/posts/a-successful-git-branching-model/ . The author also wrote a tool, "git-flow", to assist with this model https://github.com/nvie/gitflow .
I have heard the terms "git branching model" or "git workflow" used for the concept that you call "gitflow".