really early Greeks
Homer, or whoever composed the Odyssey, is usually dated to the 9th century BCE.
Yes that's why I said it's possible. But, why doesn't Cyclops have large tusks? All the author in question seems to be quoted as claiming is that "some sources" say the Cyclops has [presumably normal sized] tusks. What sources?
Also of course, though it is most likely Homer lived ca 700-900BC we don't know for sure, since the earliest extant Greek manuscripts are around 2,000 years later, ca 10th or 11th century AD. It is certain that Aristotle taught Homer to Alexander the Great in about 343BC, but I don't know whether there are any earlier literary allusions to his works.
It's possible, but I don't think it's possible to know for sure that the legend was based on ancient archaeological finds. I do find the other hypotheses more convincing, however, regardgin the Griffin, etc.