Earlier quoted context omitted.
> That’s why a lot of companies only promote after demonstrating a track record of performing at the next level. If that's the case, why is this article needed? Someone promoted to Principal is already savvy, why would they benefit from this advice?
Why does an experienced programmer ever need to look anything up? It’s useful to have reference materials to check against, or for things you haven’t worked in recently.
This is like reminding a top doctor "do differential diagnosis". Nope, top doctors already know this, it's redundant advice.
This is like reminding a good thinker they must think about things: they already know this and it's presumably how they got to the position in the first place.