1. MIT-style licenses are "do what you want" as long as you provide a single line of attribution. Including building big closed source business around it.
2. MIT-style licenses are "do what you want" under the law, but they carry moral, GPL-like obligations to think about the "community."
To my knowledge Georgi Gerganov, the creator of llama.cpp, has only complained about attribution when it was missing. As an open-source developer, he selected a permissive license and has not complained about other issues, only the lack of credit. It seems he treats the MIT license as the first kind.
The article has other good points not related to licensing that are good to know. Like performance issues and simplicity that makes me consider llama.cpp.