There are few Greeks in FYROM, it is mostly, well, Macedonians (in this discussion, this is so confusing), and ethnic Albanians.

FYROM is predominantly Slavic in nature (with a strong Albanian element), so it has about as much claim on the legacy of Macedonian Greeks as the modern Italians have on the Etruscans ... it is there, yes, but everyone else has it, as well.

Only the most isolated communities can claim any sort of descendancy, the kind that did not have contact with outsiders for centuries. The area of today's FYROM is not at all isolated and has certainly not been ignored down the years, so any claims are foolish, at best.