But the Linear A wasn’t in Greek. They haven’t “broken” it yet. Absent a “Rosetta Stone” its unlikely they will.
Its my understanding the Linear B material really realtes soley to merchandise, business transactions, nothing that can be used for real historical documentation. I didn;t know they had found it at Pylos, but since that was a Mycenaean site, I guess its not surprising.
Sir Arthur Evans found a lot of Linear A and Linear B at Knossos, and invented the terms, and I believe the Knossos collection of Linear B texts is still the largest. Carl Blegen, an American archaeologist, started excavating at Pylos (home of Nestor according to Homer) in 1939 and found the archives with Linear B texts right away--fortunately because WWII and the Greek Civil War prevented more work at the site until about 1950. There have been some smaller batches of Linear B found at other places on the mainland.
The number of Linear A texts is much smaller. According to John Chadwick's article on "pre-alphabetic scripts (Greece)" in the Oxford Classical Dictionary, Linear A goes back to about 1800 B.C. (Chadwick helped Ventris in the decipherment of Linear B, but Ventris is given most of the credit.)