Yes, but note in the article they are already declaring him as having chosen his party because he participated in the debates this Thursday. They consider this case closed.
They don’t think he should be able to go third party now.
I don’t want it, but that’s really up to him IMO.
That doesn’t matter. In Alaska, Lisa Murkowski lost her bid against Joe Miller in the Republican primary, then ran as an independent write in vote - and won. I think this is what this statute says. Had she won the R primary, then she would have been prohibited from running as an I or Reform Party candidate.