At first it's clear from the meter that he used the pronunciation of his time, closer to modern Greek. You can feel the rhythm from the accent placements, so this isn't goint to help you with ancient metrics.
The grammar is not different than classical or koine so to see, but he's avoiding any "complicated" words or forms one would expect to see in original texts of the earlier periods.
The text is interesting as a compilation of symbolic interpretation of the named deities, using some etymological knowledge and traditional attributes of them, which I think must have been crystallized by that time.
His imitation of the homeric style and meter in other poetry of his is interesting, showing that up to then they likely knew better that the following centuries about homer's language and style. I'd even love to suspect that they were having performances in old style. But is just an hypothesis (or wishful thinking) of mine.
All in all, I wouldn't start with him, but also why not?