It's worth noting that the paper was published in ACS Sensors, a journal on the topic of "new and original knowledge on all aspects of sensor science that selec

It's worth noting that the paper was published in ACS Sensors, a journal on the topic of "new and original knowledge on all aspects of sensor science that selectively sense chemical or biological species or processes." So, the sensor-validation angle was the primary focus of the study. They also tested treated versus un-treated wastewater. I can't get past the paywall, so I couldn't say if they give any justification for whether their sensor would be a good indication of in vivo behavior or not. In order for dangerous DNA damage to occur, the offending compound (or relevant metabolite) would have to get into cell nuclei in meaningful quantities, which is far from a given.