I also read that in his book, and it wasn't something I had consciously thought of before, but I believe it is an important point.
What I believe Anchell is saying is:
1. use more than enough developer (i.e. more than the minimum technically required), in order to ensure that is not an issue affecting the development of your negatives
2. if you dilute a stock solution 1 to 1, you must use twice the volume you would use of the stock solution to ensure there is enough developer, and so on for increased dilutions
I have only ever used D-76, but those seem like good advice to me.