It’s not about the universe having a correct temperature, it’s about the fact that the universe is expanding, while supposedly it’s a closed system with no energy input coming in from the outside.
In that situation, as the universe expands, the temperature should be steadily dropping, since the same fixed amount of energy is being spread thinner and thinner. Instead, they are observing the opposite happening. Either that means the universe has not been expanding this whole time, or there is some other source of energy input, or some other variable we are not accounting for.
It was joke, as weak as it was. However, you do make a point. Maybe the extra energy is coming from another galaxy of beings who don’t have an EPA bureaucracy? If so, we need to export our tree buggers. I still wonder what happened to the Universe contracting, as was the theory at one time.