This is true. Data Centers overprovision their capacity, so if one server is hitting full capacity, the spare ones can be spun up to share the load.
They will have to buy new hardware. The total workload remains the same. If each computer now process 30% less workload, they will have to increase the number of computers to meet the total computational demand.
But I am a statistician, not a computer hardware scientist, so take my opinion as a grain of salt.