Presumably. Also would be determining a pathway that gets those low concentrations through to the organism in levels high enough to induce the effects that they've determined with artificial exposures. But that's not even hinted at in the study, and that's usually where these studies fail.

I can introduce high levels of NaCl to a cell and kill it, but without finding a way that dunking someone in seawater kills them via mere exposure, saying the ocean is hazardous is a bit of a stretch.