The whole point of the article is that the new MacBooks are running on iPhone hardware. And that therefore there’s no reason for you not being able to install MacOS on your iPhone. Even your old droid was locked down and you were not able to install a real OS which would have given you the freedom to run what you want without restrictions
I remember one time I had a coworker sit down next to me with her MacBook, iPhone, iPad and iWatch and that was an “aha!” moment for me. She had spent like 5x more than she would have if 1 or 2 devices could do all of those things.