It also makes the standard assumptions that AI will be implemented on and stable on the von Neumann style computing architecture.
Of course, if it's not, it could port itself to such if doing so is advantageous.
Would you agree that one possible route to uFAI is human inspired?
Human inspired systems might have the same or similar high fallibility rate (from emulating neurons, or just random experimentation at some level) as humans and giving it access to its own machine code and low-level memory would not be a good idea. Most changes are likely to be bad.
So if an AI did manage to port its code, it would have to find some way of preventing/discouraging the copied AI in the x86 based arch from playing with the ultimate mind expanding/destroying drug that is machine code modification. This is what I meant about stability.
ITT we talk about whatever.