Not true. CA is actually a castle doctrine state. It does require, though, if you actively know a person is not a threat, that you do not shoot them regardless. So for example I had a blacked out drunk neighbor try to open my door at like 4pm after NFL games were done. He was obviously a complete wobbly stumbling wreck, and in this case had he somehow opened the door I would be bound to proportional force unless in fear of my life.
However, absent this kind of thing it’s castle doctrine. A shit ton of wealthy people live here, you think they’re not going to shoot intruders?
Another difference with places like TX is that you cannot use deadly force to protect property outside your house.