Not true. Macedionians were considered hicks much the same way the stereotype of people from Arkasas are considered inbred hicks. That stereotype does not make them any less Americans. (or bill clinton not a US citizen)
The were Greek, they did speak Greek. The entire world at the time considered all on the penisular Greeks, every city state on the penisula considered themselves Greek, and the stone writings and writings that have survived list the Macedonian provence as Greek.
The only reason for the modern change is the yougoslavian land grab by renaming a slavic provence "macedonia" in the 1950's.
Macedonia is part of Greece. The birth place of Alexander is in Greece, the burial tomb of King Philip is in Greece.