All he’s really selling is the idea that if you switch to a flimsier E-fluted box, that has half the cardboard of a B-fluted box, you will pay less and save more trees. And that his box design gives more ridigity to an E-flute box, so the customer doesn’t think his getting the El-Cheapo box and won’t have the pizza slide out of the box, before he even gets out of the door.
Regardless, the steam from the pizza is going to mess up an E-fluted box, warp it, make it soggy, etc.