Earlier quoted context omitted.
There's been plenty of evidence that nothing is recorded or sent back, hardly "absence of complete proof". People have identified basically everything coming from the network stack of an iPhone. This is already normalized in most modern office buildings. There are video and audio recording devices in virtually all common areas. This started a bit after private offices were done away with.
> People have identified basically everything coming from the network stack of an iPhone. Scary. Shouldn't it be encrypted?
Even if it is, the software on the device could theoretically do whatever it wants with the data before it's encrypted/uploaded, and if it's sent to Apple, they could do whatever they want with it too.