I'll be upfront with you: bitcoin is probably the worst "tech" ever mass-adopted. That's my bias.
1. The banking industry is thousands of times more important that crypto for everyday Americans. It's what literally makes our entire economy run. Crypto is used for speculation. What you should be comparing bitcoin against is the energy it takes to list a few ETFs on an exchange, which is essentially the cost of a few hundred servers, aka nothing. Bitcoin is ungodly inefficient and will only become more inefficient.
2. "It could be less, much less, or much less," This is a filler argument. Study says "around" a number, so you're arguing it could be a really broad definition of "around"? Not a serious take.
3. The absolute number matters because it's showing the economic activity is being concentrated in the pockets of just 137 entities. This is NOT a broad-base economic phenomenon that helps employ people in communities around the country, like say running gas stations (another polluting industry). If you're going to use 2% of the nation's electricity, you'd want the benefits spread across at least 2% of the population. Not 0.00002%.
4. Net energy consumption pulls from our current energy grid. Within a grid, if you use more clean electricity in one area, it'll pull more supply from dirtier sources elsewhere. Saying that bitcoin mining helps "green" the grid is a myth because you have to mine it 24/7/365, which means intermittent sources like wind and solar are at a big disadvantage. Battery storage tech is not there yet, thus gas plants and dirtier sources have to kick-in to keep up with 24/7 consumption.