They erred in the other direction. The English descriptor of "forty-three trillion, eight hundred billion per year" is correct. The number shaved a trio of zeros by accident.
8,760 hours x 5B = 43,800,000,000,000
And I, too, am skeptical. Sounds like a meaningless calculation based on really silly choices of data points.
Now, I am neither a denier nor a skeptic. I am fully on board with anthropomorphic climate change. But this kind of rhetoric is worse than useless - it's counterproductive.
I once watched a news segment where they did bacteria checks of a home of a woman who kept an immaculate house. They found contamination all over the place. I looked around my home and thought, "Well, fuck me. If she can't keep it at bay, I certainly can't, so I won't worry about it."