One day, hopefully, people will understand that DxO tests are lab-based. No more, no less. Whatever test conditions you pick, it means compromising on something else. Always. They chose their test conditions and all we can do, as an (hopefully) intelligent audience, is keeping them in mind when we read the outcome.
Now please some of the detractors, design a lab-based BIF test. Of course the lab must be as big as a forest to be realistic, but with tightly-controlled lighting conditions everywhere. Oh, and it has to be reproducible of course, so you'd better think of how to convince the bird to keep flying back and forth the same path and at the same speed over and over again.