Since Disney pretty much shut down its studio over the virus, I don't think "Mulan" is happening now. Not in theaters, anyway. The most likely scenario now is for them to release it on Disney Plus, just as they had done with "Onward", whose theater performance had been aborted due to the virus.
Also, while I realize that New York is the main hot spot in the U.S. right now, with a third of all cases in the country being in that state, isn't California a hot spot, too? Let's not forget, the federal government did not bring on the lockdowns in the states. The states did that on their own. If the federal government reopens businesses, then the virus cases could easily go through the roof.
Finally, one of the comments in Dusty Sage's article stated that COVID-19 has killed Hollywood as has been known forever. It is claimed that all movie houses are going to be closed for good because of this, especially as streaming starts to make up for things, though they will obviously not be bringing nearly as much money as the box office tickets for, say, "Black Widow", which, if put on Disney Plus, would bring in nowhere near enough to cover the billion dollars or so price tag of that movie. Hollywood would have to restart again in order to open up theaters across the country, and if California is a hot spot, as I think it is, then that just isn't going to happen.