Where did I say his numbers are right? I have no idea if they are right or not because I don't have time to go research it, and I didn't express an opinion either way (although given the source, I have my doubts). Even if his numbers in this narrow case are correct, I don't think they're relevant to the real intention behind Earth Hour.
And as to not doing anything more to raise public awareness, I think it's valuable to do so because people are subjected to a constant torrent of advertising telling them how wonderful it is to use all these gadgets and drive all these cars, plus propaganda from politicians and industry telling them that global warming is a hoax and pollution is good for you.
Disclaimer: I've never participated in Earth Hour and may never do so, but I encourage events that make people think about the costs of our energy-thirsty lifestyles.