I'll certainly watch the movie again to see what it says.
But even if someone in the movie says he is not force sensitive, in my imagination he will always be. I'll just assume whoever says he's not is simply wrong, even if it's himself.
Just doesn't make much sense if he isn't at least
a little in tune with the force, with how good he is in fights despite being blind.
Another explanation is that the force "answers" to his chants, like if the force is some kind of "divine force" that listens to prayers.