Define "cool".

I dunno about the author, but for me "cool" means something like $temperature < 25C && $humidity < 60%.

No amount of ventilation is going to keep a building "cool" like that when there's a 49C (120F) heat wave outside as the article says. Or even 35C, if there's any humidity involved.

A large temple with thick stone walls, on the other hand, could remain substantially cooler than its surroundings through a couple of weeks of unusual heat wave, because it has a large thermal mass. That's an architectural style that we might actually want to emulate. Increasing ventilation probably isn't going to help, though, in that case.