That was a Gripshift thing. Gripshift is well... kinda gone.
People have to understand that these two events (gripshift and the tiff exploit) revealed 4 exploits, not 2.
The Gripshift exploit (User)
The tiff Exploit (User)
joek's Kernel exploit
Davee's Kernel exploit
So joek's Kernel exploit is "not a gripshift thing", the same way Davee's exploit is not tightly linked to the Tiff exploit.
Not that I've seen either of those, but I wouldn't understand if it were otherwise.