The first two-thirds of this tutorial seems to be focused on breaking down the components of a standard subtractive synthesizer (essentially the synthesis process itself). However, it doesn’t really delve into how these components are interconnected or how they operate as a cohesive system. The latter part of the tutorial is more aligned with what you're referring to.
That said, the knowledge gained here isn’t universally applicable to
all synthesizers, it's only applicable to Subtractive Synths. If the tutorial took just one additional step, it could provide a more complete foundation, but as it stands, it leaves you wanting more (or worse, not know you need to know more).
For a more versatile pointed approach, I suggested using something like VCV Rack, because Its modular interface allows you to import only the modules you need to explore or explain a specific synthesis method. This hands-on method enables you to experiment and internalize the concepts, which can then be applied to the synthesizers you have on hand.
Most tutorial videos are 5-10 minutes long, and completely reproducible and it's very clear the signal flow from one part to the next.