Google doesn't know it to be true because it is not true. Volkswagen ECMs are not over-the-air updated. They can't be. They don't have the physical hardware to do so. As a matter of fact, conventional ECU flashing is so risky it is highly recommended the car be connected to a battery charger to maintain voltage stability. Even better, a bench flasher (for aftermarket tuning). Even then, the flash is not always successful. When it is, it causes several codes to be thrown that have to be reset with a factory tool. This coming from someone who has byte-wise modified modern 2004+ VW ECU firmware with a factory-trained VW electronics specialist.