MJ just repackages and resells other manufacturers' yeast (mostly Lallemand and Fermentis,) they have no labs of their own and are notorious for not knowing or inquiring as to what's in the packet and just calling them all S. cerevisiae. But the genetic data has gotten a major update again in the last month, and if you've followed it these past couple of years, yes, the conventional categories of "ale" and "lager" and "cerevisiae" and "pastorianus" have been shown to have been quite a bit more confused than was thought. Many lager yeasts are cerevisiae, many ale yeasts pastorianus, and in fact there are far more than these two basic classifications. Dave's chart is kept well up to date and we should applaud him for it; that said, his interpretation of some of the data will naturally differ somewhat from that of others like Kristoffer Krogerus (suregork) or other denizens of the labs and interwebs. It's all in flux still at this point. But all that matters is how a yeast works for you, so ignore the labels and terminology and carry on brewing as you were!