I have been printing for a living since 1976 , those notes are a joke and completely useless and very misleading to young printers.
Basically turning a simple process into a complete useless diagram that nobody in their right mind would follow. It is very misleading and complete useless info.

I suggest that one should , look at the neg, look at the easel , and look at the print as it emerges in the developer, by observing one will make better prints.