Even assuming that what he claim is true and can back with evidence, he would need to go further and show that loss of productivity caused by remote working is massive enough to: offset cost of borrowing commercial real estate (Or much larger real estate with corresponding maintenance bill in case on-site location is need for other reason), paying employee transportation, giving up remote talent, etc.
It is entirely his fault for not preparing for the time where people will actually bring out calculator when there was moon-sized sign post for several years.