To repeat their last two sentences:

> Even before LLMs we were aware if it: we knew people moving to managerial/PM roles eventually get their coding skills rusted. Well, now we are all in those managerial roles...

There's always some component of a skill that is not merely knowing something but practising something seemingly procedurally. Even if I understand integration well and have done it thousands of times, if I don't continually practise it from scratch, I begin to forget tiny bits and pieces and that accumulates to an eventually lack of understanding. So it is true for all mental tasks. There really isn't such a thing as understanding something completely without working it out by hand, from scratch. AI exacerbates a lack of understanding in this regard, although admittedly layers of abstraction in the coding realm already do that to some extent...