Here in Romania ( the biggest plum producer in the world) the Pluots,plumcots ,etc would be considered mislabeled because they are not real plum ( Prunus Domestica) hibrids .
They are american plum hibrids wich we dont even consider those plums and we call them ,,corcoduse,,( mirabelle fruit) not ,,prune,,( real plum,Prunus Domestica).
None of the pluots,plumcots have real plum genes in them.
EDIT: they are not even Myrabelle ( Prunus domestica var Syriaca) hybrids with apricot but instead they are hybrids made with Prunus Cerasifera ( myrobolan used as rootstock) or Prunus Salicina ( a chinese ,,plum,, thats a soird of a chinese Myrobolan) and apricot.