Is it really a True Ending in the sense you mean, if the author's preferred plot is going down a different storyline?
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People can change their mind.
I know that the ending that you talk about is the True End in regards to Rising Angels: Reborn, I played all of the endings for crying out loud.
As for you calling that "the source material", there is no source material, this is an original story, and either way, we should be grateful we got at least some kind of continuation of the story, since Rising Angels: Fates isn't out yet, and that is supposed to be the actual sequel to the true end. If you truly knew "the source material", you would know that Judgement is not supposed to be the sequel to the True End, Fates is.
For all you know, Judgement can be simply exploring a different ending which doesn't involve all of the crew being straight up outlaws, at least not right after Reborn's story.
The "source material" in this case IS the author's VN. It doesn't have to be from Type-MOON or some other AAA publishing company to be a source material. And since the sequel's ending, (which is out and complete now) nearly the entire cast is set to be made enemies of some one now anyway. What with the revelation at the end of this one.
Cue "I don't think it means what you think it means" comment.
"source material" implies that this story is closely based on something that's already been written, and follows at least the general storyline of said work. Think Ready Player One and it's movie adaptation. The book would be the source material. The basic plot and everything is pretty much the same, even though details are different, or missing altogether, but it is pretty much the same exact story (starts the same, follows a similar route, and finally ends the same). This is not the case here.
So hence why the "there is no source material" line. Sure, this is a sequel to something, but the thing that came before is not the source material, as that would imply that this is just a rewrite of Rising Angels: Reborn.