I wonder if it wasn't the miner at all. Maybe the guy had an (illegal) cellphone jammer as well, and somehow managed to convince the feds that it was his antminer causing the trouble.
"On November 30, 2017, in response to the complaint agents from the Enforcement Bureau’s New York Office confirmed by direction finding techniques that radio emissions in the 700 MHz band were emanating from your residence in Brooklyn, New York. When the interfering device was turned off the interference ceased. You identified the device as an Antminer s5 Bitcoin Miner. The device was generating spurious emissions on frequencies assigned to T-Mobile’s broadband network and causing harmful interference."
They only narrowed it down to his residence, then he himself said it's the miner. It's totally possible he used it as a scapegoat for something else he was running.