Legitimizing Bitcoin more than offsets the environmental benefits of electric vehicles.
The alternative to your narrative is that this is promoting permissionless cryptocurrency that is hard for the government to print and manipulate, not necessarily Bitcoin per se.
Additionally, if proof-of-stake coins and DeFi can take over some of the manual paperwork done by banks, it would amount to energy savings.
Right now bitcoin is the leader and everybody knows what it is. Compared to other coins, it has a more mature ecosystem to support the needs of a corporate treasury. Companies choosing bitcoin now doesn't mean a proof-of-stake coin cannot take over the mantle later. You can consider bitcoin to be the first coin that lands on a beachhead in the disruption of traditional finance.