This doesn’t pass my smell test either. The diet specs sound like they’re intended for persons who WILL NOT need extra calories because they will be in area of confined physical activity.
Moving the nmumbers around it would seem you could sustain a smaller group of ‘subjects’ for a reasonable length of time with the nourishment they need without giving them the energy to do anything physical. (like riot or escape)
If this is like the coastal disasters, most people are not going to stick around in a dangerous structure/home pining for any such disaster aid. They take their important papers and stuff that is not ruined and move it into storage and themselves into temporary housing - like an apartment or friend/family’s home until their home is fixed.
People in the area that will be affected by the fault line need earthquake insurance so they can rebuild!