I have met and worked with a few people that fall under the 10x banner. Incredibly clever people who kept their intelligence in check with pragmatic solutions.

Some tough problems that took other skilled developers months they could solve in a couple of days and they could consistently do it across the tech and domain sphere.

I think the issue is people claim to be 10x, if you're claiming to be 10x then most likely you are not, the 10xers I've met have all been very humble.