I could not find a reference to 60dB in the paper. It states 30dB SPL in the relevant plot, which is very quiet.
"In the lab, the researchers showed that commercially available equipment could transmit sound to a person more than 2.5 meters away at 60 decibels using the laser sweeping technique"
Granted, the laser sweeping technique trades off fidelity for the volume, this is still just laboratory tests and is not a "final product" in any sense.
This claim still isn't in the paper, though. Not sure why the press release makes this much bolder claim. Seems a but weird to me. If I had the measurements to prove that, I'd include them in the paper.