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Assuming EV purchases on average replace existing cars not add new ones. (They do in a long run)

Energy usage:

Before buying an EV: X with Y convertible to green. After buying an EV: X with Y+d convertible to green.

Before a new miner starting: X with Y convertible to green. After: X+d with Y+d convertible to green.

It doesn't matter if the new miner is running 100% green, because they still use energy which could instead replace some amount of fossil fuels. We're not really isolated in this context - all of us suffer from not removing the reliance on burning coal.

Not only that but the same logic can also be applied to bitcoin, which aims to replace a financial system based on a petroleum standard.

More easily than your new combustion engine car, I think was the argument.