Further, if programming skill follows a normal distribution, the 10x programmer bucket is under 1% of the population. You, dear reader, are probably not a 10x programmer.
The true 10x programmers will not have 10x productivity in most giant tech companies. Google and friends have put in place mountains of progress in pursuit of downside protection (eg extensive testing, release barriers, and so on). Google invented Golang partly to address issues with mid level programmers being unable to code well.
These downside protections also blunt any benefit a 10x programmer could have, which is why so many people claim to have never seen them.