The Outrider only showed up in the Special Edition, which we all know came out after Lucas went insane. It was not in the
original Original Trilogy.
Wookieepedia credits the Wild Karrde in the novels and XWA, not Episode 3, but it could be wrong. Either way, if that's what was referred to as 'pirate-modified', they should have just said so.
If not, it probably isn't something we're too worried about, although 'modifying' could be as simple as another table entry. The Wookieepedia also credits some form of Action VI with being in Episode II, but it doesn't mention which one. The base ship is in numerous novels and games though, so it definitely warrants us getting it done.