The only difference is that Alameda County opposed the factory reopening. Not the city of Fremont, not the state of California, not the federal government. It was the county that held its reopening up.
The state gave discretion to the county and the county was enforcing a standard that Elon didn’t want to follow, or else wanted to stage a scene to justify his inevitable relocation to a state with cheaper labor. Now we’re back to the original county schedule.
Not even recommended guidance, just advisory. AKA "Here's a one size fits all list we expect you to tailor to your particular situation."
Never mind that “federal guidelines” have no legal relevance to county or state health orders. The US constitution leaves police power, including quarantine orders, to the discretion of the states.