Was 2021 too early for AI training to be the reason?
No, we aren't really. Did you ever hear someone say they couldn't use their computer or TV because it uses too much power? How about refrigerators? Air conditioners might be in that category, but only the poorest people would use an AC less because of cost.
>but only the poorest people would use an AC less because of cost
I think you may be surprised here.
Well there are the crazies that ran the Paris Olympics, who wanted athletes to not have AC. I suppose there are also some very miserly people who can afford AC and refuse to use it. But let's just say my statement is general and leave it at that.