dual pixel autofocus mirrorless teleconverter

This image (heavily cropped) was shot from 45 meters away on a T7i with a 100-4005 5.6 L Mark II and a 2x telconverter making it a whopping 1280mm.....at the minimum F 11 (hand held BTW and I changed a couple of numbers on the plate). At that f stop autofocus does not work through the...