The low occupancy rate of field hospitals is evidence that either the lockdown worked, or that it was unnecessary. It excludes the case in which the lockdown

The low occupancy rate of field hospitals is evidence that either the lockdown worked, or that it was unnecessary. It excludes the case in which the lockdown was obviously necessary and just barely worked, since that's the case in which those field hospitals would themselves have been overwhelmed or nearly so, as well as the existing ICUs. Without regard to the actual effectiveness, the fact that the field hospitals went mostly empty will fuel acrimonious debate about said effectiveness.