Having read all the details it's not clear that this applies to non-CA incorporated companies hiring remote workers who happen to reside in CA (or move to CA).

Having read all the details it's not clear that this applies to non-CA incorporated companies hiring remote workers who happen to reside in CA (or move to CA). I'm not even sure how they could enforce in that case, honestly. If you're incorporated in CA, it's pretty clear you have CA state requirements to comply with.