Okay I am new in this stuff so please don't laugh

According to Felix Domke presentation there are two kinds of memory pages in Xbox 360.
Writable and Executable, so the game cannot change (for instance by exploit) some part
of the memory and put execution there. We already know that using shaders ("King Kong
vulnerability") we can put code in the memory which is executable!(Hypervisor vulnerability
uses it). So is it possible to use shaders to put some code in memory and then use some
kind of game vulnerability to poit the execution not to the stack/heap but to shaders memory?