I agree. It seems to me the essay came more from a place of wanting to see lots of big ideas come his way. And more of the people who are attracted to the big idea and can at the very least convince you they'd have a shot at actually pulling it off. Those are the people he'd love to see walk in the door.
I took that essay as a call for more people to please start applying to YC with really big ideas so they can fund more of them.