The job description does't read like the Bills are looking for a therapist to sit around with players and talk about their childhood feelings.
The idea behind cognitive neuropsychology is that there are scientifically proven ways to increase mental processing speed. That's why the job posting is requiring bio and Neuro feedback.
There are really cool mind controlled video games that use spatial / information processing to sharpen mental processing.
Also, all great players need to perfect their visualization skills, qb's most of all.
A really good sports psychologist can help a player increase their mental processing speed, visualize their keys, footwork, technique ect. and help them come up with routines to shake off bad plays and get their head back in the game.