I had to do a double take and confirm the article's date.

It talks about, say, restarting servers(implying downtime) and going to each one of them and updating one by one.

If in 2024 you are still treating servers as pets, you are still subject to outages if a single machine dies, and you are still manually configuring them, you are doing everything wrong.

And that's before we consider that most of the advice would not apply or have to be done very differently if the app was running in, say, Kubernetes.