Well, here is how I see it. Since Hablis is not a single creature - but a mixture of creatures - it can't be an ancestor and therefore is an invalid category for transitional status. With Hablis gone, there is no clear cut transmission between the Australopithecines and Homo Erectus.
You say, "since ... not a single ..." "it can't be..."
How is that? If the current list of species included in hablis are, in fact, a mix of species how does that mean that one of them can not be an ancestor to H. sapiens? I don't see your logic there.