It's really, really close though. The kill distance of six miles is what tips me over the edge of reading it as sarcasm.
Sure. That's why these safety officers exist. I think some other funranium posts state.that (paraphrased) "safety rules are written in blood."
That said, I suspect folks like that would tend to phrase the rule in a way to diminish the implied impact/likelihood, rather than enhance it or state as-is, as (afaict) the original did.