It wasn’t. My implications when it came to Discord was that I wanted to give him an air of mystery surrounding his moral intentions. Even in the new draft, its made clear to the audience that Discord has some sort of grudge against Celestia because something happened between the two of them long ago that essentially made Discord the way that he is.

Whether or not it was him being turned to stone is never mentioned in either version of the script. Just that something happened between the two of them that lead to Discord building up nearly over a millennium’s worth of hatred and anger.