Agreed, any real 10x engineer would scoff at the term. I've known maybe a handful of people I'd consider 10x in my career.
I've only known one. And having that type of engineer isn't necessarily all it's cracked up to be.
The other members of the team would discuss a problem, hash out a couple of potential solutions, and then begin assessing how long it will take and who will do which parts.
Two days later the 10x engineer would drop an amazing implementation of the solution into our laps.
The result is that everyone else on the team got demoralized and stressed about whether they were going to have meaningful work to point to in their performance assessments. The entire team ended up blowing apart.