What actually never happened, to nobody's surprise.
So now we have .Net that was renamed into .Net Framework that is legacy, .Net Core that is legacy but compatible with the modern version, and .Net that is current. Anyway, the platform never stopped being called .Net, because it's larger than just the runtime.
We also have 2 different number sequences starting from 1, and one starting from... some times 4, other times 6, depends on your point of view.
We also have a bunch of confused people without any reason, because all of this is as clear as water. But anyway, it's not the author fault that he didn't communicate the version in an adequate way.