Lionfish can survive in not-very-salty-water

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It would be interesting to see how long they can live in the low salinity.

I would guess they can take the change for a while. I've found them in tide pools in the Philippines, where a heavy rain could drop the salinity pretty quickly.

But if kept in fresh water for weeks they may begin to weaken. I've had tilapia (hybrids) and raised salinity in tanks to 25 ppt from about 10. They looked great for the first month or so then began to develop lesions on the skin and started dying. I dropped salinity back to 10 and most recovered.

Since they've never been described as a resident of estuaries…I wouldn't jump to conclusions. Perhaps one COULD genetically select for low saline tolerance.
 
Humans breath air that is abut 0.04% CO2, but we can breath it at levels up to about 5% before it becomes toxic, and it's not generally fatal till it's up to 7-10%. But I don't see people rushing out to put bags over their head to raise the CO2 level.
 

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