A minor nitpick in an otherwise inspiring article: I feel like the argument about ad efficacy also wants to have it both ways - if advertising sucks, why do we

A minor nitpick in an otherwise inspiring article: I feel like the argument about ad efficacy also wants to have it both ways - if advertising sucks, why do we believe that it works? Or in other words, if advertisers are good at advertising themselves, why would they be bad at advertising anything else?