Earlier quoted context omitted.
This looks like a pump and dump scheme in its finest form. Nothing changed over last year in regards to energy consumption. There's no way that Elon or those in Tesla discussing this were not aware of this prior.
A pump and dump is approximately the least likely explanation.
More likely is that Musk liked the idea of Bitcoin, but got a lot of pressure from environmental activists after committing to it and decided it wasn't worth it anymore. Companies change their positions based on the outcry of political activists all the time. That's far more believable than saying Musk tanked his own company in effort to execute the worst pump-and-dump of all time.