K2* just means K2 which hasn't been classified in another branch - as soon as it is classified it will no longer be K2*. So far only a few Australian Aboriginal Y chromosomes have been fully sequenced but all K2(xNO, P) has been under S1-B255, and all the K2(xNO, P) tested for P331 has been positive, hence under K2b/MPS. None of the K2* found in other studies checked these SNPs, so there is no evidence they have anything outside of MPS or even S1. Actually there are many other cases of reported K2* besides in Australia, mainly in Indonesia if we count only those with a decent number of SNPs. (I wouldn't rule out the Indonesian stuff is pre-NO.)