I can tell you that the "extinction risks" that EA people are likely to be concerned with are things like nuclear war, runaway AI, runaway bioweapons, catastrophic feedback loops related to global warming, etc. The "extinction" they're referring to is that of the entire human race.
If you thought they were referring to something else, I wonder where you got that idea.
If you thought they were referring to something else, I wonder where you got that idea.