Playground for his cronies from the wonderful US of A, that's all it is.
I don't think he ever intended to build the "affordable housing" that was one of the conditions he got the planning permission for, either. Also - anybody who knows anything about tourism in Scotland knows that there are very few Scottish people working in it - so what was that about jobs for local people, another one of those conditions? When I first moved to Scotland (1997) I worked in a hotel. At least half my colleagues there were foreigners. Then the company (small chain of hotels for coach tours, family owned) got public funding to build another, brand new hotel in an area with very few jobs. Guess what? They had to go to Ireland to recruit staff, as they simply couldn't find enough Scots willing to work in the "hospitality industry" - always hard work and paid peanuts. So if that Trump hotel ever comes to pass, there'll be a new influx of eastern European workers, who these days seem to have a monopoly in Scottish hotels. Somebody has to do the dirty jobs... And unless the pay is way above average (for hotels), no locals will be doing it, especially not in the Aberdeen area, where unemployment figures are fairly low compared to the rest of the country. And Trump won't pay more, since nobody makes that kind of money by paying the skivvies well.
I'd better stop now - otherwise I'll spend the night on here listing his crimes!!!