From the source in the OP
DBC: The PS3 is notoriously difficult to program for, have you considered releasing the game on PC or Xbox 360 in order to bring the game more in line with your original vision.
HK: I am done with MGS4, however I am not done with MGS. I know management at Konami has been interested in putting the game on those platforms for a while now, but I would not be involved.
That seems fairly clear. Kojima would not be involved, either in programming, or in advertising. Clearly, he is trying to draw upon the hype of the whole 'MGS4 4 360' thing to advertise whatever his next game is







