I am sure there's a greek word for this fallacy, but Finnucane is being facetious. They're just arguing that this longtermism is not long term enough, and if we

I am sure there's a greek word for this fallacy, but Finnucane is being facetious. They're just arguing that this longtermism is not long term enough, and if we really, really, really cared about the long term, we would argue with the collapse of the universe in mind. It's a critique when someone's reasoning stops at random points that coincidentally align with someone's interests is just a tool to enforce their point of view, not a virtue of the argument itself.