Jesse Gabriel, an assembly member and author of the bill, said in a statement that “if Twitter has nothing to hide, then they should have no objection to this bill”.

“Assembly Bill 587 is a pure transparency measure that simply requires companies to be upfront about if and how they are moderating content. It in no way requires any specific content moderation policies – which is why it passed with strong, bipartisan support,” he said.
https://www.theguardian.com/us-news/2023/sep/08/elon-musk-twitter-lawsuit-california-free-speech