Did you read the article? Because he mentions athletes right there in the beginning of the article saying that most of the times they get the bikes for free. His article is about the average Joe.
The author makes it look like only pro racers are fast enough to benefit from carbon bikes. I guess he's never met good amateur racers, they are very fast, the big difference between an amateur racer and a pro is in how long they can sustain a given power, and the ability to sustain it after a very long race. But most amateur races are done at speeds above 40km/h on the flat, where aero matters a lot.