My college risk assessment thesis 23 or more years ago agrees with their conclusions. In fact, most Americans have no idea we already use sewage (biosolids) on crops for fertilizer.
There are safety limits that need to be met and soil types to consider, but we been using it for decades.
My brother worked at a sewage treatment facility for 40 years and one time I visited him at work. There was a building that had a slide coming out from the peak, like a barn, and there was this brown stuff (looked like dirt to me) sliding down into a dump truck. I asked and he said they treat the people poo with something (I forget), then sell it to fertilizer companies. He didn’t know what the fertilizer was used for. This was back in the late 70s.