For sure. In that example, the survival could definitely be life-threatening or not.
Life-threatening: single mother has to try and keep her kids safe from nature in the unforgiving wilderness.
Non-Life-threatening: storm knocks out power, single mother stuck with other parents and strange kids.
It might be helpful to think of Survival as a warzone story, whether life-threatening or not: a character is stuck in an environment that they can't stand or figure out, with seemingly no escape, and they have to put up with it as best as they can.
All that said, having read back all of the mystery stuff, I don't think @pattyloof's story is in Universe at all. The stuff about poisoning, and the honeymooning couple investigating feels more like Physics. It depends on the conflict, I guess, but that's my gut. I'm not sure it would be in Survival, necessarily, anyway.