The author suggests moving all 20k NIH employees to Cleveland, and seems to think that all 20k will go along with this instead of finding different employment that doesn't involve uprooting their families and moving to Ohio.
Also, the DoD makes fast changes like this all the time as the result of BRAC. Government employees don't tend to just up and change jobs - they are career workers who like the stability and promise of a pension.
Nothing fast results from a BRAC decision.
It's not uncommon to have meetings that have NSF, DoE, DoD, NIH and HHS employees all in the same room. This was especially valuable during public health emergencies.
It's not the same salary, DC's locality pay is higher than Cleveland's : https://www.opm.gov/policy-data-oversight/pay-leave/salaries... vs https://www.opm.gov/policy-data-oversight/pay-leave/salaries...