I just had a look at their example (BWV 775) and the first thing I noted was this: Second finger on the Bb in bar 8 makes no sense (there's no reason to not use the thumb there, especially as the following interval is a seventh).

I hope the internet won't become flooded with sheet music that has bad auto-generated fingering, because it's something that you really trust. If I encounter some strange fingering I trust that the composer knew something that I don't that I maybe should work hard to apply to my own technique, obviously this will damage your technique if it's nonsensical.

> Second finger on the Bb in bar 8 makes no sense

It seems all the more illogical as very similar patterns occur in bar 2, 6, and 10, and the thumb is used every time there.

(Not a pianist myself)