You are arguing against the idea that there is a factor of ten difference in productivity between the best and the worst engineers. That’s fine if you want to do that, but that’s explicitly where the term “10x engineer” comes from and what defines its meaning. So if you disagree with the underlying concept, there is no way for you to use terms like “[n]x engineer” coherently since you disagree with its most fundamental premise. You certainly shouldn’t reinvent different meanings for these terms.