Can anyone explain how bitcoin's current PoW would ultimately result in the same energy use as PoS? Everything I have heard, except the interview below seems to say that PoS uses less energy than PoW.

During a recent Bloomberg TV interview, Caitlin Long, the CEO of Wyoming based digital asset bank Avanti, stated “There is really no difference in the ultimate energy use between proof of work and proof of stake. I had to laugh out loud when I saw Elon Musk’s tweet today.”
https://ecoaction.io/laughing-at-musk-talking-out-of-your-a-award/

I do understand that bitcoin's PoW used way less energy in early 2010 when the difficulty factor was 1, but now that it is over 20 trillion and unlikely to drop significantly, I can't understand Ms. Long's statement. Of course, she has many years in the crypto space along with a Harvard Law degree, so maybe I am missing something.