Linear B maps onto Greek quite well once you understand that it is a syllabary, not an alphabet. The fit is imperfect in specific, well-understood ways.

Once you correct for well-understood systematic gaps, though, the underlying grammar, vocabulary, and even some divine names (Poseidon, Zeus, Hera, Dionysus all show up) are recognizably continuous with classical Greek.

It is flat out Greek. I can even read some of the transliterations. I laughed like a drain when I saw that one of the leading characteristic key words of Aristotle's teaching, 'heneka' is the main connector in the oldest written Indo European text. three goats heneka one coat , i.e. 'for the sake of' in the context of a list of palace exchanges.