Private exploits do exist, and yellows8 showed this for new 3ds, but mathieulh want to act like he is part of the club while he is clearly not. He is just a troll
I don't know what club you are refering to, I am not part of any team/circle or whatsoever that has yellows8 in it (or anyone in the #3dsdev chan anyway)
Also what makes you think people can't find bugs/vulnerabilities on their own ? If you don't think that's possible, then you are simple minded.
(and I am not saying I am not trolling, mind you, because I really do not care)
I'm not saying people can't find bugs/vulnerabilities on their own, I'm saying YOU can't find bugs/vulnerabilities on your own.
Yellows8 sure can.

