https://covid19.ca.gov/essential-workforce/
> In accordance with this order, the State Public Health Officer has designated the following list of Essential Critical Infrastructure Workers to help state, local, tribal, and industry partners as they work to protect communities, while ensuring continuity of functions critical to public health and safety, as well as economic and national security.
> Blocking critical infrastructure is illegal
and pointing out that there are an enormous number of things which were labeled critical infrastructure during the pandemic, like any store that sells food.
You’re splitting hairs in an unhelpful way which distracts from the point entirely.
However, enough grocery stores have to be kept running, or else people could run out of food, or the food supply chain could be disrupted.
So, "essential workers" means that they have to be protected and encouraged to work as a group, but that if some individual ones quit or have to take time off work, it will be OK. Whereas in this crisis, if even one grocery store closed, that could, depending on the area, cause a problem.
I am saying that during the pandemic for the purposes of restrictions and exceptions, people who worked at grocery stores were "critical workers". It's a big old caution for using words like "critical" which are very vague in order to implement policy assuming it will be used for things you deem to be important, because you do things like that and now there's precedent. Grocery stores are critical infrastructure now so some picket line for a labor dispute at a grocery store is now legally arguably a banned protest.
When opposed to things, people are usually very happy to give away freedoms they don't realize might have adverse consequences in the future.