Overall, your article's great, but this isn't true at all. The Philistine language likely was a Semitic language (https://en.wikipedia.org/wiki/Philistine_language), not an Indo-European language like Greek. And even in the less likely situation it were Indo-European, there’s not at all enough evidence to say specifically that it was Greek. Greek is a strong candidate, but considering how far back it was, Hittite and Phrygian are also strong contenders.