Of course, a deep ecologist who sided with extinction would be hoping for a horrendously narrow event, between ‘one which ends all human life’ and ‘one which ends all life’. They’d still have to work against the latter, which covers the artificial x-risks.
I agree that it covers AI, but I’m not sure about the other artificial x-risks. Nuclear winter severe enough to eventually kill all humans would definitely kill all large animals, but some smaller forms of life would survive. And while bio-risk could vary a lot in how many species were susceptible to it, I don’t think anyone could construct a pathogen that affects everything.
You’re right. I think I had in mind ‘AI and nanotech’ when I said that.