It has always been maintained. The al-Tahir family that owns it are Scotland's richest (they also own the Highland Spring water brand among other things) so I don't think cost is a particular concern, though frankly I still think the whole thing is bizarre.
Lee Strutt, the long time course manager, got sick of maintaining a course for no golfers a couple of years ago and moved to Surrey to the RAC club last year.
I have it on good authority that they will finally open next year but I shall believe nothing until I see evidence of golfers there!