Like Howard, I think people are being a bit harsh. I really don't think this programme (or his new album) attempts to promote him as a top-notch professional musician. I thought it was more like seeing another side to someone we 'know'.
Perhaps Allen Toussaint just enjoyed himself without checking the Who's Who of blues musicians first.

This TV series is called 'Perspectives' and its whole point is to show famous people doing something they love which isn't what they're famous for. I think that's fair enough.