Noone said anything about ignoring culture. Culture is important, it's right there in the post you quoted. Science is just more important.This is blatantly false. Culture unlocks policies, governments, governors, envoys, and all sorts of additional gameplay elements like Alliances and CB... all of which that supplement your strategies. They are as important as a new tech if not more on a case by case basis.
Culture and Science go hand in hand. Neither is better than the other and ignoring one is symptomatic of inefficient play.