This is plain wrong. There is absolutely no dispute what so ever among historians about the Greek origin of Macedonia. The new country of Northern Macedonia in no way disputes this either. Comments like yours are the prime proof that what happened is very very wrong.
This is a quote from Wikipedia about Alexander the great.
>> Alexander was awarded the generalship of Greece and used this >> authority to launch his father's pan-Hellenic project to lead >> the Greeks in the conquest of Persia.