Not the first and not the last
I have worked for Vestas (in fact I have been to the main offices in Aarhus too), and having been involved in a few wind farms I can confirm that the turbines in question do have the three features mentioned. Also when communication is lost the PLC they should shutdown and operate the emergency brake system. However some engineers have commented that sometimes this breaking system can become faulty due to the conditions they work in/under. As this is onland I can't comment on the conponents used (I work with the offshore ones which are slightly different due to the marine enviroument).
However where man and machine are involved it is often proven to be a missed failure during inspection of man made fault which is the reason. Vestas engineers are very well trained (I know I took part in a fair bit myself) but they are only human and when you arrive to something like that you can do nothing but sit back and watch.
Surprised they left the Van that close though.. Looks like an old V52 too...
I'm a little surprised that the video made it onto TouTube however as this is not the first and Vestas have managed to keep the others off the internet.
To keep it in context they are not the only company that has suffered problems and Wind Turbines are still very much an experimental way of harnessing renewalable energy.
Blimey I could tell you some stories.. ;)