Bitcoin mining sucks up a LOT of electricity. I run 2 GPUs mining 24/7 and it sucks up about 400 watts. Between the HLG lights and mining, it could attract attention, but isn’t likely to. My power draw between mining rigs and lights is probably between 800 to 900 watts.
I still wouldn’t worry too much. You don’t hear of this very often, and this guy had 120 mining rigs that probably sucked up around 30 megawatts of electricity, which would certainly attract attention.