Get that both right.
5.1 yes.
Mixed into 5.1 from analog masters.
What he is also saying is that the new DVD's will be the first time that the movie will be mixed into 5.1 from Digital Sources. That sound guy went and put all the old stuff onto a puter or something like that. I'll try to find the article about it for you.
So yes the 97 versions were 5.1 mixes but they weren't digital 5.1 mixes. A simple miss understanding. But damn they sounded good didn't they?