Let's ignore that Bitcoin is climate arson, and that its only used for money laundering and buying drugs. Bitcoin has a max throughput of 7 transactions per second. It's utter lunacy to suggest that it could function as a currency for a country. This will only end in tears.
Energy use is not energy source. There's been no full accounting of the carbon footprint of bitcoin mining, only its use. Much of it is done using geothermal or other renewable sources. (edit, incorrect) That El Salvador is adopting it refutes your second claim. Then there's the lightning network which increases the transaction throughput. Everything is going to be okay.
Do you think they are wrong? By how much?