The Skopje 2014 project is, in a way, an attempt at forging a national identity that's equal parts Slavic and neo-Ancient-Macedonian -- and the Albainans, feeling left out, have protested quite loudly about it. More on that here: https://www.degruyter.com/document/doi/10.1515/soeu-2018-003...
Also on the Wiki page:
> https://en.wikipedia.org/wiki/Skopje_2014
> "Sam Vaknin, a former adviser to Nikola Gruevski, has stated that the project is not anti-Greek or anti-Bulgarian, but anti-Albanian. In an interview, he said "Antiquisation has a double goal, which is to marginalise the Albanians and create an identity that will not allow Albanians to become Macedonians.""
All very interesting, I think. It's a nation that's trying to find itself, trying to build up a coherent national identity in real time.
As for the Greek thing, it's totally obvious that Ancient Macedonia is within the borders of modern Greece. Philip's palace at Aigai is a ~4 hour drive from Skopje, and indeed south of Thessaloniki. So the N.Macedonian position re: Alexander the Great is a little bit farcical. But I suppose they could say that they are inheritors, of sorts, to the Roman Province of Macedonia...
And regarding the ancient borders of macedonia being currently in greece, after the Ottoman empire collapsed borders were drawn in the region as a result of war, not as a result of ethnicity. Thessaloniki before WW1 a quarter of the population was slavic speaking bulgarians and macedonians, a quarter jewish, the rest was greek and turkish. There were pogroms against macedonians both in bulgaria and greece, all the way from around early 20th century to around WW2, and it stopped when the current borders were drawn because of the Yugoslav partisans. In fact, in the first balkan war, bulgaria could've occupied and kept thessaloniki if their army arrived a day earlier, but they were beat only by a few hours by the greek army led by the king, because the ottoman general decided to surrender the city and not fight. Not only that, but macedonia as an independent country was first theorized (not sure if its the right word) by macedonian and bulgarian revolutionaries that were operating in thessaloniki, with the goal of getting rid of the ottoman occupation. So, the current borders dont mean much. Macedonia was actually divided in 3 and stopped existing in one of the balkan wars, because all the neighbouring countries got a slice of it. Luckily Tito and the yugoslav partisans won, and hence the borders are now what they were post WW2. If the axis had won WW2, the current Macedonia would've likely been a bulgarian province right now, joining the western side of bulgaria which is also called macedonia (pirin macedonia).