I'm sorry I am really not seeing what you are referencing from your link. This appears to be a link to the state administration manual which deals with how departments in the state of California operate.
This does not appear to be a law especially when you look at the procedure for revising the SAM.
Responsibility for updating SAM content is assigned to authoring state departments
Ie. Not assembly members.
Edit: sorry I didn't respond to your second point. From the Cali law:
1798.503(b) An operating system provider or a covered application store that makes a good faith effort to comply with this title, taking into consideration available technology and any reasonable technical limitations or outages, shall not be liable for an erroneous signal indicating a user’s age range or any conduct by a developer that receives a signal indicating a user’s age range.