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I think it has to do with optics. I'm not sure they want to be breaking news during a national emergency.
Maybe, but the whole COVID-19 thing isn't going away anytime soon so they are likely going to have to go forward with it during a national emergency at some point. Plus, I think giving people something to think about other than COVID-19 probably would be a good thing.
Anyway, they may be selling this as being about COVID-19, but I suspect it has more to do with gaining more time to work out a CBA before free agency begins.