I'm constantly asked this question and I don't really have a good answer yet, though I generally side against calling most sites true linksland.
To me, the difference between dunesland and linksland is in the grass cover. True links had a natural cover of fine grasses ... sometimes you see signs in Scotland to the "links," which is not a golf course but a grassy park next to the sea.
That would eliminate Bandon, Sand Hills, Barnbougle, and Neal's land from the equation ... though I have seen one "true links" site this year.