You aren't off at all. The article is making the same argument that the myth of the 10x engineer is not someone who can crank out 10x more lines of code, but someone who can bring 10x (or InfinityX) business value to the company because of what they spend their time working on.
Author here. +1. I didn't mention the multiplying effect of also empowering people, but we agree that the take that defines a "10x engineer" as someone who cranks 10 times more code is irrelevant, even though I have seen it used as such, a lot (mostly as a joke, I must say).
