Because they didn’t. And anyone that is capable of critical thought can easily take the few numbers they provide in the article and do some simple calculations.

They claim the motors pull more than 1mw of power. So using 1 mw for 30 minutes is 500kWh. That means they paid 1 cent per kWh. (Spoiler. They dont)

And nowhere, does it say the plane weighted 25000 pounds. It says it “can exceed” 25000 pounds. But by no means does that mean that’s what it weighted in this test.

The most likely scenario is that the plane was bare minimum rather than maximum. I doubt even passenger seats were installed.