I interpret Brian's answer as lazy paddles to look good, but screw (or water jet) propulsion.
Two fake sternwheelers in Australia had the lazy paddle removed. I'm fairly sure those on Brisbane River and Sydney Harbour are real.
180928F-Melbourne'HeraldSun'-Thames-boats-DixieQueen
I'm guessing Elizabethan ahead and Edwardian alongside.
Roderick