Video 3 get a root shell agains 27.0.1 which is the latest iOS version installed on my lovely se3.

This really blown my mind, and seem the 1/2 video is installed a app by click pdf link?

I guess and hope there will be update from apple quickly

There are loads of these exploits which exist in the hands of private hacking groups and state organisations which have not been made public. Always assume your device is able to be compromised from those who have the motivation and dedication.