Oh it's true, I can confirm.
I've been standing next to the car (2 metres away), and my mate went to try and unlock it, and he couldn't.
I had to be right next to the handle pretty much to unlock it.
I've also got something out of the boot, whilst the car was locked, and still passengers couldn't unlock it at the front.
So totally safe. I'm a big fan of keyless since I had it on my Toyota before. The GTIs is definitely a lot better.