Is there anything behind this or is it just another angle of attack against bitcoin prompted by remarks by Bill Gates?.....is it even possible to calculate consumption in this way?
There are multiple kinds of factories that consume a lot of energy, especially those that produce devices such as smartphones, consoles, hardware, and so on. Every year, a great deal of energy is wasted in the production of components that aren't used or sold. Actually, if they use a lot of power, which means they're tripling their production rate, they'll make a lot of money, particularly if their product is in high demand. I'm not sure why they keep blaming bitcoin when some private producers are among those who waste energy on products that are only used for entertainment.
Read this https://bitcointalksearch.org/topic/debunking-the-bitcoin-is-an-environmental-disaster-argument-5325350