I feel like this argument is way too imprecise, to the point of being basically untrue. That's probably based on the average emissions or something like that, but people are not the same and "emission responsibility" is wildly different.

Imagine killing 34k exploited African people, the world's climate won't even notice that. On the other hand, killing 34k middle class Americans or Europeans would probably be a little more effective, but still won't fix anything. Now, killing 34k high-profile megacorp executives would definitely be much more effective, but would also collapse some economies, leading to various climate unfriendly events (like riots, war and shit).

But the simplest empirical evidence is: COVID killed 6 million people and the climate is still shit.

Source: I made it the fuck up, I'm talking out of my ass