"Gov. Moonbeam" has no intention of supporting widespread applicability of SA rights in California.
As someone else mentioned, establishing the fact that the State recognizes SA rights for U.S. citizens says nothing about further efforts by the State to curb citizen's rights to select any firearm they wish.
The State goes on to petition the courts to recognize the State's interest in selecting which firearms the State feels are appropriate (read "safe").
Once that right has been recognized in the courts, the State is then positioned to continue to refine the definition of "safe" using more and more onerous definitions [e.g. "magnetic rings" or "biometric sensors" so only the owner of the gun can fire the gun, taggants in propellents so that only the owner of the gun can (legally) be able to fire the weapon (...if taggants are found at the scene of a crime, guess what happens to the owner's gun rights?); State-supervised sale of ammunition in the same way that State liquor laws are currently enforced, etc.] The State of California will indeed ensure that your SA rights are observed - but only within what the State deems to be "safe"...
Anyone who might for a second feel that Jerry and the State of California have your best interests at heart should take a minute and reflect on what they may have in mind for five to ten years after this sort of legislation is granted by the courts and then passed.
When it comes to California and gun laws, celebration is premature...