While that's a pretty extreme statement, airport security's usefulness is definitely in question. Most other airports outside the US are significantly less strict (don't have to take off shoes, for instance), and there have been tons of youtube videos showing how you could easily slip in weapons of various sorts through airport security.
It's practically a meme about the fact that they throw out all "might-be-bomb" liquids into trashcans right next to you -- in the same receptacle.
It seems much more like security theatre, and maybe thanks to terrorist groups, but more thanks to sensationalist media + clever people who take advantage of the capitalistic system (one of the heads of the TSA just-so-happens to make the machines they use to scan your luggage, "private" business on the side that he gets paid for.)
In addition, TSA Precheck / Clear / Global Entry are all ways to pay to have less inconvenience -- but have you seen any statistics they've been able to give out about stopped terrorist attempts? Don't you think that would be a thing that would be promoted if it was happening?