I can assure you that there are quite a few who are, and even moonlights the scene.

That doesn't necessarily have to be the case here however, the h4xors in question could just as easily have written the malware too.

No, are they organized well?

They are split up into categorical sections of what data was released and/or each release serves a purpose ( a pst mail dump )

They are all compressed using rar files. Rar releases are trademark of scene releases. This was done by professional hackers who have been around long enough to stick to using rars...

I don't advocate downloading the releases so I can't really say much about the contents of the files themselves, only regarding the directory structure, since the file listings of some of the releases were publicly released online by infosec pros.