[Brightcolours]

It is not about tracking, mirrorless tracks more accurate it's about finding and locking on the subject which is essential for birds in flight, can it do it as good as a DSLR

It does it better than a DSLR (see that video from Tony that botched the tracking via the EVF due to the review setting).
With my DSLR for instance, I have to make clear to the camera what to focus on by putting the center AF point over the bird at first. Even then, it can arbitrary focus on the bill, the body, the head or the wing.
With this R5, it can lock on an animal all by itself, and even on the eye of the animal, even with birds in flight. You can eve switch between animals with the joystick.