I've always been under the impression that the dismissal of the "myth of the 10x programmer" was more about its use as a general hiring filter rather than whether there exist prolific programmers (examples of whom seem readily available).
1) myth of the 10x programmer - true
2) "we hire 10x programmers" - look at salaries - false (even for companies like Google and Facebook, who hire -at best- 1.5x programmers)
Also this is pretty silly.