Thats weird. Didn't know that.
I guess you spoke too soon.
If the fellow with the illness has given consent for this, or is in on it in any capacity, I don't think it's tasteless. I know I'd want my condition and possible future cures to be front and center on the world stage if it could change minds and affect future generations. You need to stop thinking this is purely about MGSV advertising because quite frankly I think Kojima is over trying to popularize the franchise. Why not use the franchise to popularize ideas that are important to him?