Even worse than super-subjective, it seems like people don't agree on the definition of "10x programmer".
Is that 10x value (code * code quality) produced per unit of work-time? Per brain cycle? Are you controlling for programmer experience, or domain knowledge, as [1] pointed out? Do you actually mean 10x, or is that a stand-in for "significantly more productive" with an unknown value? Do you include collaborative skills and working with a team, or even entirely base your definition off of that?
I'm both curious as to the exact definition you have in mind, and also trying to point out the more general issue so that others arguing past each other can realize that they have two different ideas in mind.