There was continuity in that the same Y haplos that were expected by even some people in this forum were found. The same haplos that are found in the Anatolian mainland. There was not a wholesale replacement by R1b.
True, but the Peloponnese was part of a different BA tradition, the Helladic, that spread from Thrace around 3300 BC. The Minoan likely came directly via Anatolia.
There was a leak about an almost CWC-like in LN Greece afaik, so steppe ancestry in the mainland could be old.