I've time-marked his discussion so you go straight to the recommendation he is making.

"How to setup a base fuel map for larger displacement LS engines"

He's saying copy the table of VE values and update to your new displacement.
(Increasing Displacement in the software scales up the VE vales, as you probably know.)
Then, he pastes the old VE values back into the VE table.

I'm not understanding. If you increase the displacement value, and the VE values adjust as a result, that is not what is intended by software design?

What is the logic behind changing the VE values back to the old displacement VE values? Help me understand the logic. Is he right or wrong?