California ADU Laws

You can now add at least two adu’s to any property zoned as single family, a regular and a junior, meaning that all single family homes in California can now be triplex’s “in theory”.

My question is that is it legal to rent out rooms in your house as well if you don’t give them home access? If it has a private entrance and a bathroom then it’s the same as an ADU except that there isn’t a kitchen. And the whole point of these ADU laws is to increase the amount of affordable housing.

So is renting out rooms, but locking the room door to the house and disallowing home access legal or illegal in California? Does anybody know?