I’m one independent contractor doing engineering at one farm. I’d be surprised if I was even on whatever list was used to estimate what must be tens of thousands of farm workers in CA. In fact farm workers are so often undocumented they cannot have an accurate tally.
I don't think it matters. They wanted to pipeline people, knowing that some would technically qualify but be lower priority, but efficiency was the most important thing. That and each person getting vaccinated means less risk to them, less risk to spread to others, and less risk to mutation.
That argument only applies if they are demand limited. If they are, sure, great, get a vaccine. If they aren't, then you are quite literally keeping someone else from getting a vaccine.
I read the news regularly and the bulletins from the San Mateo County health advisor. During the time I qualified they were still running out of doses every week for front line workers. I am not a front line worker. It was not my place.
