The project of Skopje 2014 was actually a big money embezzlement scheme for the regime back then which was borderline dictatorship and mafia. The top dogs actually squeezed the whole government budget for themselves getting contracts and tenders, and because there was not any more money left to embezzle they came up with Skopje 2014 and got a 1-2 billion euro loan from european countries in order to build it. The project was to renovate and build the city centre in baroque style, and create massive monuments from people all the way back from Ancient Macedonia, to more modern revolutionaries from 19th-20th century. This was in line with their nationalist and right wing rhetoric. Saying that is anti-albanian because the albanians have protested actually doesnt mean much, because political parties there usually illegally pay people to attend protests to further their own agendas. The political parties in Macedonia are actually segregated by ethnicity, with 2 big ethnically macedonian parties and 2-3 smaller albanian parties. One party cannot achieve majority to form a government, and back then the leading party called VMRO DPMNE, which started the Skopje 2014 project, actually had a coallition with the leading albanian party called DUI. This project was voted on by both parties, which achieved legal majority in the parliament and was approved. Not to say there wasn't massive corruption, but definitely not antialbanian, since the leading albanian party approved the project. In addition, despite 20% of the population being albanian, it doesn't mean that the country and its history and culture is albanian. Half of the albanians living in macedonia at the moment immigrated in the 90s because of the kosovo war.

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).