The accounts I’ve read only say they were Greek as a general description of a “sea people” of “Aegean origin”. I’ve read that some people link them to the Myceneans but I’ve not read a study that clearly links them with such a specific group. Late Helladic IIIC pottery is said to link them and if that’s true I’d like to read the research.
I was wrong — Santorini blew in 1700 BC, so these wouldn’t have been Cretans there. These could have only been Myceneans or Hittites. But since the Myceneans were sea-farers while the Hittites weren’t, we’re left with only the Myceneans as the Sea peoples, imho