

I assume it’s to help people visualize volume/distance/size/etc. If an article said “50,000 gallons”, it would be much more precise, but also harder to relate to. When an article says “500 Olympic-sized pools”, it’s significantly easier to picture in my mind.
It’s also worth remembering that this is a newspaper intended for the casual edification of the general public, not a scientific document.
I hope that these people continue in their refusal to take the court seriously. It used to frustrate me, but I’ve realized that it’s much better than endless delaying tactics and other legal shenanigans.