Is a TTL wireless flash trigger something meaningless?

I have a couple TTL flashes (Nikon SB-910s) and also a a couple of PocketWizards but I see on the internet that there are triggers that support TTL and that confuses me.If I am understanding correctly, TTL is dependent on the focal point of your lens, so if TTL flash is sitting on your camera they yes TTL has a meaning because the flash is in the same distance from the subject as the focal point of your lens but when we take the TTL flash off camera and put it like two meters away then to me TTL is meaningless. If that assumption is correct then what do they even mean by Wireless Triggers that support TTL?In that case do they just mean you can manually set the power and zoom of each remote flash without having to walk to them? So basically just setting zoom and power remotely is what they mean by TTL triggers?