true, but dumps would still be recorded on the scene, but there's Not a single thing
it could indeed be just 1 team and everything is kept to themselves, but dump data is normally quite public, same as the 3DS games and firmware dumps.
Not if they're internal. Normally I don't trust announcements like these, but if the website was not hacked, then it's probably true. After all, they're a pretty reliable group and have a solid track record. Even respected members from the Gamecube scene collaborate with them (emu_kidid).