The article does not specifically mention brain injuries but the change in rules might benefit some of you. It does state that people who feel anxiety in busy or noisy environments could qualify.
I work as a helpline advisor for the public and professionals. I took a call from a woman the other day who had cancer on her brain and spine yet did not meet any of the tick box criteria for the Blue Badge. Many people do not but have just as much need for a Blue Badge as someone with physical disabilities.