> he didn’t consider as the most important factor that the second time around he already knew how to do it

How'd you get that idea? Being faster because of something you "already know how to do" is like half the point of the post. The author even includes an anecdote that serves as an extreme example about how slow they were at working out code when they first started programming because they had to stop and think about loops.

It would be one thing if he'd written a post that includes the first few paragraphs here about writing <this> utility and then later writing <that> utility, then concluded, "… and that's why language X is better than language Y" or something. But he didn't. Which leaves me baffled by your comment.