I saw the movie and wondered about many things. How could "Stu" be approved to be a priest when he could not function and do Mass? Just the NO but still he could only listen to confessions. How could he keep using bad language when he was striving for the priesthood? They made it seem God used him over many years in his affliction (lived to be 50). I left the NO many years ago, and do not regard that as a true Mass, but a false church and this movie just confirmed that even more. I agree "You don't give a chance for entering the seminary to a unqualified man just because he argued about it with his superior. You don't give a disabled person ordination out of fake charity."
They are so hard up for vocations that they'll take just about anybody (unless, of course, he is a traditionalist and wants to celebrate the TLM). I have even heard of a case where a priest was ordained who was autistic, and they were trying to find a way for him to say Mass nonverbally. Words fail me. (No pun intended.) They also attempt to offer Mass celebrated in American Sign Language.
As an aside, the Traditional Latin Mass, especially Low Mass, is made to order for autistic people. There is no constant assault upon the senses, and the silence seems to dovetail nicely with autism. It is also far less demanding upon deaf people. With the way that every "difference in ability" is accommodated in our society nowadays (some of this good, some of this "run into the ground"), you'd think that modernist bishops would be all over a Mass that is more accessible to those with sensory issues. But no.