Not possible for apple to patent this technology?
Sure, some new things they could, but the basic facial recognition methods they're using have been around for decades.
Heck, Face Id likely got seriously started when Apple bought the company that did Microsoft's Kinect dot projection system, and more recently, a photographic face recognition company. Both from Israel, btw.
Then retina
There were Windows Mobile phones with retina resolution back when the first iPhone came out.
And the iPhone long used GPUs developed for WinMo and other smartphones.
I never understood why Android fanboys were saying Apple copied this.
They're mistaken. Different method entirely.