A zero percent mortgage rate is not going to get people to board cruise ships, hop on an airplane to see folks back home, watch the latest movie release at the Irvine Spectrum Theaters, or go out and spend money. We're a consumer based economy and low rates isn't enough to get people to spend their time and money. Look at auto sales - Zero Percent Rate financing has been around since 9/12/2001 so will any amount of rate cuts help sell vehicles?
As noted in the other thread about COVID-19, this is a reaction to deflation caused by a virus I can see why they did it. I just can't see any benefit. Can you?