When you have racks that are full of 4U GPU systems that pull 3-6kW each, the power requirements per rack shoot up to 60kW+(with whole rack setups blowing past 100kW). So an AI datacenter requires over 20x the power compared to what they needed in the past. This either strains the power grid near the DC or they need to create on-site power to fulfill demand, which has noise and other concerns.
I work near a datacenter and you can't hear significant noise from the outside, maybe a slight humming sound but quieter than traffic. This is a DC that has been around for over a decade and uses power from the grid since most of the loads are non-GPU based.