Instead of reading the article I will tell you why the docs are wrong. It's because most teams don't incentivize writing documentation and a lot of them just don't care. The team guru's job security is predicated on knowing the answer to everything so it's a losing proposition for them. If you write good docs about one of these topics, don't be surprised if they try to find a way to punish you for it.
If you're in an SWE job, only write documentation if someone tells you to. Otherwise, just give up.
If you're in an SWE job, only write documentation if someone tells you to. Otherwise, just give up.