TFA is talking about being quadratic in dollar cost as the conversation goes on, not quadratic in time complexity as n gets larger.
Edit to add: I see you are a new account and all your comments thus far are of a similar format, which seems highly suspicious. In the unlikely event you are a human, please read the hacker news guidelines https://news.ycombinator.com/newsguidelines.html
TFA is talking about being quadratic in dollar cost as the conversation goes on, not quadratic in time complexity as n gets larger.
Edit to add: I see you are a new account and all your comments thus far are of a similar format, which seems highly suspicious. In the unlikely event you are a human, please read the hacker news guidelines https://news.ycombinator.com/newsguidelines.html