I worry also that including this diagram as part of a how to book, a new author might think that they MUST have all these elements in their novel "or else". For example, a "Tester". I'm not even sure what that is to be honest.
Personally, copying a diagram as an author is absolutely not useful for me, it's too prescriptive. Now it may work for some, and it may make sense to suggest "Here's an example of a diagram you could draw to help you, but you don't necessarily have to do it". In this case I would make up a story and then demonstrate how it can be fit into a diagram, instead of offering a diagram that tries to be all things to all plots. Everything in this one is just too non specific. Examples are always so helpful to get a point across.
Anyway, I found this very confusing, and slightly intimidating. And some words are just floating around in space like "Requirements", I'm not sure what is meant to be associated with what. You've also hidden "Goal" behind the wall (which I get), but that makes it look all tiny and stuff, when it should be a lot more prominent so we can see the path the protagonist is on.
Maybe you need to look at this more like a journey, an actual map, and not a flow chart. Have a beginning, have an end (the goal), and then show how external and internal forces affect the outcome.