Ah,.now here we differ.
Cognitive exertion - even if I take mini breaks immediately at the onset on ROLS (rapid onset symptoms) sill cause delayed PEM. Especially if I repeat that several times during the day and it will be even more pronounced if I were to do that several days in one week.
This is one of the reasons why I struggle so much with filling in the forms for benefits such as ESA. I have to repeatedly concentrate then rest and repeat far too often and filling in the form can easily cost me a couple of months of PEM.