Thank you. I've been trying to convince people that coal power isn't bad because solar exists and is gaining production share. As long as alternatives exist, coal does nothing to the environment.
A correct version would be: I’ve been trying to convince people that power isn’t bad, even though some is generated with coal, because solar exists.
And that version makes sense.
Read that sentence like "As long as proof of stake exists, proof of work is a 'moot point' toward the environment."
They're making an analogy to the OP comment to argue that it's a bad excuse.