The issue is that California requirements apply to eggs produced in Minnesota and North Carolina too, if producers might sell eggs in California.
Chain stores and restaurants have national distribution systems where it’s too costly to segregate commodities based on origin location.
You must be one of the very few that read the article, and had the grey matter to comprehend what was written.
The CA law effects the entire nation unless the courts slap them down, and so far that isn’t happening.