Here is the original study published almost 4 years ago. It consists of analysis of a jaw found in Greece in 1944 and a tooth found in Bulgaria in 2009.

It is debateable if Graecopithecus should be phylogenetically classed as Homo or Pan due to hybrid speciation. It is certainly at least a distant cousin, though there is insufficient evidence to class it as a common ancestor of both and therefore an ancestor of Homo.

David R. Begun (who co-authored the study) concedes "the possibility that El Graeco’s tooth shape and size may have occurred independently from early humans, and admitted he would like to have more and better-preserved fossil evidence supporting the new hypothesis. "

“We just don’t have enough evidence to come to that conclusion,” Bernard Wood of George Washington University, who was not involved with the new study, told HISTORY. “It’s perfectly possible that one or more fossil apes have roots like that.” As he pointed out, it’s not uncommon for primates to evolve the same morphological traits or features independently from each other. “If you asked me, how much would I be prepared to bet that this is a hominin,” Wood continued, “you’d have to persuade me to put more than a quarter on [it].”

So no this does not suggest that mankind arose in Europe. It does suggest that some very distant ancestor or cousin lived on the fringes of modern Europe in a world that looked very different geographically from today.

We are talking 5 million years before Homo Erectus. So Graecopithecus freybergi lived in the late Miocene with the emergence of the first apes in a world that looked like this, whereas Homo Erectus emerged near the dawn of the Pleistocene Ice Age that looked like this. The idea of Europe 7 million years ago is very different to Europe even with Neanderthals, which lived in "modern" Western Europe before Homo Sapiens.

This title makes a hypothesis then tries to make the very limited evidence support the hypothesis, which isn't really a hypothesis but a semantic trick.