Did you read the article? The author shares their perspective.
For me, Git is quite powerful on its own with version control, diffs, branches, merging, etc. Forges just add a UI for some of these things, and add an issue tracker/ discussion/etc. Forges also add a more modem ui for repo access though git does have its own webserver you can use. I use git without a forge for a number of my personal projects that I’m not sharing with others or not yet sharing
Well just speaking for myself, i use git without a forge for personal stuff because i was already familiar with git and it fits my needs. No need to learn another version control system for some basic projects i throw together