That looks great value, perhaps coming soon to an ebay listing near you at a much higher price..........
That said it's done one mile since 2006 (probably a push mile), and nowhere does it say it actually runs, or even turns over. "a rare machine that will require recommissioning" could cover a multitude of sins. There was also a ridiculously cheap DBD34 Gold Star (sold for £5,500), that was taken off the road years ago with 'engine issues'. I don't suppose you can take them apart for a look inside until you've actually bought it. As with almost all barn finds, before you can restore anything you first have to find and fix the issue that was beyond the capabilities of the previous owner when they took it off the road years ago. Been there, done that.
If only I had more garage space, though, something like one of these could be an excellent next project.