Come on, maybe not "exclusive" in an absolute sense, but the level of competition isn't even remotely similar. As an academic, I'm directly competing for something literally dozens of times a year (in each grant application, promotion application, evaluation application, salary complement application, grant/project request, paper submission). Each of these has an acceptance rate, we are competing directly among other academics. And each of these directly affects our career. Even when we are tenured professors we can't get away from it, because we have postdocs and students whose own careers depend directly on us and we can't let them down.
My friends in industry don't have an even remotely similar experience, of course competition exists in industry but it's not a constant pressure that you feel every day from several different sources.
The post makes an effort to argue that competition is just one factor among many, but I think it explains like 90% of the overwork phenomenon.