I thought it was well established that Minoan script is a form of early Greek.
Not exactly.
The Minoans used two methods of writing, hieroglyphics (probably derived from but not the same as the Egyptian variety) and Linear A, a script but not an alphabet, which may have developed out of the hieroglyphs. Neither has been deciphered.
Linear A developed on the mainland among the barbaric Myceaneans into Linear B script, which has been deciphered and shown to be early Greek.
All attempts to similarly decipher Linear A have failed, which probably means the Minoans spoke a completely unrelated language.