> Who are these other researcher? Care to link to their research on this?

When a bitcoiner says something is "debunked", what they mean is that someone wrote a post on Medium. In this case, it's an investment banker who put some money into electricity companies before he put money into Bitcoin: https://hackernoon.com/the-reports-of-bitcoin-environmental-...

Digiconomist's response: "Verify, don't trust" - he shows his working. https://digiconomist.net/verify-dont-trust/