"Jedi Scum" was never in the flick. There weren't multiple audio mixes attached to certain prints. The line was "Die, Jedi Dogs" and was never anything else.
It's sort of like how people SWORE they saw Biggs scenes in Episode IV back in 77. Or more closely, how some people SWORE the line in Return of the King during the paths of the dead scene was "That Blade was broken" when it was always "That LINE was broken."