It isn't like he is the one who did the research to lead to that decision though. That just isn't his job. He isn't an analyst. He is CEO, who reads reports or sat in presentations made by his analysts, whatever their specific position titles, who are really the ones who did the work weighing and making this decision. His role was to say yes to these people whose job it is to actually figure this out.

So indeed, if he was not CEO, likely whoever would have been would be given the same information as Jensen that lead to him saying yes on tensor cores. And in all likelihood, the same exact decision would have been made, or at least a coinflips odds chance if it really were a matter of "yes" or "no" with no clear winner.