The 22 figure is based on the post proof-of-stake energy cost. For the vast, vast majority of it's history, it used proof of work. And it's also worth noting th

The 22 figure is based on the post proof-of-stake energy cost. For the vast, vast majority of it's history, it used proof of work. And it's also worth noting that many, many, many cryptocurrencies still do. And, while 22/1 is infinitely better than 160,000/1, that's still 22 times more energy used to facilitate the transfer of funds, which we already have methods to do more efficiently.