It reminds me of Jane Elliot's teachings. It's not that 'there is no difference'. There is definitely a difference. The truth is that difference is good. It's good that we have both good and bad programmers. It's good that some people are rockstars, and others have to struggle. Diversity is good.
The problem is not "the 10x myth". I don't think its a myth. I think there are 10x althletes, 10x doctors, 10x engineers. Pick any field and the spread between the best and worst performers will be enormous.
The real problem is some people think that because they are a better programmer (or a better pianist, or athlete, or engineer, or doctor) they are better people. That their life somehow has greater meaning. This is the myth that needs to be debunked. Being a 10x programmer does not make you a better person. In ANY way, what-so-ever. It just makes you a better programmer.
What makes you a better person, in my opinion, is how compassionate you are, how much you care for the less fortunate and how much you work to make this world a better place for everyone.