Did you skip the bit that discusses hosting providers?
Git supports it, GitHub doesn't. People use forges, therefore they are mislead to believe Git doesn't support it.
Forges?
I also found that confusing in the article. I actually listened to it using text-to-speech and thought it was some brand, like sourceforge. But now I think they just mean any git hosting service.
Code hosting was called a forge. Thus codeforge, etc.
Code hosting services are still called forges. It's a useful generic term with a small syllable count.
Forge is the general term for Git service providers such as gitlab, GitHub, sourcehut, bitbucket et al