That's cool - there's a lot of R&D and other white collar staff there who can work from home. By reinstating 3 shift assembly on the S/X lines they can keep production output with a smaller workforce.
Only about 40% of the Fremont workforce are line workers who must be physically present.
They also have S/X pack assembly and powertrain subassembly at Fremont, which they might be able to move to GF1 and Lathrop.
Lots of ways to get higher production out of a smaller workforce present at any particular moment in Fremont.
The worst-case was a 100% shutdown of manufacturing.
There's a lot of evidence that the model Y line(s) require fewer production staff, right? Would be real interested to find out how they allocate the 25% that come in. Might not see a huge dip in production at all.