A+ comment. I've been hearing this idea that "there is no such thing as a 10x engineer" for almost a decade now and from the very first moment I heard it I considered it one of the most definitively untrue ideas circulating in the tech industry. In fact, there are 100x engineers.
Most the criticisms of the "10x engineer" thing I've seen were more about this expectation that everyone can be 10x, when they're more the exception than the rule. Your average programmer is just that: average.