The author is *completely wrong* about recapping.
You can either proactively replace electrolytic capacitors that will leak sooner or later, or you can replace them after they leak and also have to repair traces, replace components, and so on.
That “Usagi Electric” clown on YouTube says “I prefer to diagnose rather than shotgun-recap!” and, well, he’s going to be learning how to repair traces as a result of his misguided pretension.