Haplocyonoides is an extinct genus of terrestrial carnivores belonging to the suborder Caniformia, family Amphicyonidae ("bear dog"), and which inhabited Europe from the Early Miocene subepoch (20 Mya)—(16.9 Mya). "Haplocyonoides" existed for approximately .
Existence of the Haplocyonoides was only discovered in the 1930s.
I believe it was neither definitely correct nor definitely incorrect because there is no allusion to the discovery date in the context, so there is no way to know if the statement was correct or incorrect.