I see it uses SoundTouch, which I already use with BeSweet/BeLight. I figure what I need is the '-rate' setting since it seems to preserve the pitch, I just can't find the right number.
It SHOULD in theory be "-tempo -4.2709376042709376042709376042709" but that ends up long. I stupidly tried 1-(23.976/25) = -4.096
The final length looks right and the pitch seems unchanged with pretty good quality (mind you it is a commentary track).
I'll see if it successfully syncs later.