Maybe he meant training volume at at given absolute speed/intensity. E.g. the higher your aerobic capacity, the lower the "strain" at a given intensity. With which you can purchase more volume.

to me and the training perspective ive prescribed to (80/20)...

if your aerobic capacity is low, its time to do more low volume work. more aerobic capacity will raise your aerobic capacity, only up to a certain level. to raise your overall pace and become faster, you have to mix in anaerobic work to raise the upper threshold, and as time progresses you will up your pace at the lower aerobic levels, thus progressively being faster with the same aerobic output.

does that make sense?

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80/20 Endurance Ambassador