I don't think that's what they are saying. In fact if they did the metric would be pointless. Rather they are saying by estimating that value on different architectures, one can find more efficient ones. They use open model to be able to remove unknowns. They aren't advocating for one model or another, only more efficient architectures.

We propose miles per hour (MPH), distance travelled per unit of time

Stupid metric. It‘s not because you spend more time that you travel farther.

s/