Quote from the article: “The inclusion of intrusive DRM softwares [sic] like Denuvo is a choice that yields an unfair punishment on the consumer,” Running With Scissors says. “Respect the consumer, make a game they want to play, and you will never feel the need to fight piracy. The gaming industry deserves a better future, fight for that.”
They didn’t release the third game, it was done by a third party (I believe with some licensing shenanigans?), which is why they don’t acknowledge Postal 3. They didn’t make it. Which is why they (somewhat recently) have given the A-OK to pirate that game.
I’d assume that last part is why they say legendary.