Who cares if the term "10X dev" was derived from a misunderstanding of actual studies (that may or may not be legitimate), the term itself is very clearly about superhuman rock stars.
If you want to move the discussion of 10X devs away from the 10X dev then stop using the term "10X dev".
How do you define a "superhuman rock star"? Is it someone that competes at 10x the capacity of the average performance or 10x the capacity of the worst performance? Someone who is 10x the average is likely 25-100x more than the worst performer. You're selling their superhuman rock star ego short.
In any event, it doesn't really matter because engineering managers should just hire the best fit for their team. The unicorns are rare and expensive and may not be the best fit compared to just a stallion who likes to run.
If you want to move the discussion of 10X devs away from the 10X dev then stop using the term "10X dev".