Right, but we're talking about being extremely close to the point where these will fail due to unsurvivable wet bulb temperatures
It wouldn't take much humidity to turn those temperatures into wet-bulb of 100+ - fatal to humans. Expanding the area of this level of heat a couple of hundred miles in any direction would probably be enough.
I'm not sure who we is, and it wasn't clear anyone was talking about wet bulb temperatures. It's a comment on an article about Death Valley. At this point, you're just responding with things completely unrelated(behind paywalls).