This seems to be a misunderstanding by the author, a licence doesn't have to be copyleft to be free software. Even the FSF describes the MIT licence as a free software licence (they prefer calling it the Expat licence).
> Expat License (#Expat)
>
> This is a lax, permissive non-copyleft free software license, compatible with the GNU GPL.
That's exactly what it says. There is a big fat in that row as if Tailwind were not Free Software because it is not Copyleft. If he wanted to point that out he could have used a separate row and written " (not copyleft though)" or something like that.
You're right, open source and free software are not the same thing, but software licenced under the MIT licence is still free software. Even the FSF describes the MIT licence as a free software licence (see my other reply in this thread).
Yeah I'm still not following the loaded premise of this question. It's just a table telling people what the project is about.
An MIT-licensed project trying to not scare people away might have the same comparison table in their readme. They'd just flip around the green checkmark and red X.
> Expat License (#Expat) > > This is a lax, permissive non-copyleft free software license, compatible with the GNU GPL.
https://directory.fsf.org/wiki/License:Expat