You think that a minimum of 35% of demand being artificial isn't a factor that can be seen to increase overall demand?
edit: I say "minimum 35%" because that is just the percentage of immigrant-demand that managed to secure housing. Hard to say exactly how many more immigrants are bidding on SF & LA-County housing but 35% is the absolute floor.
Framing foreign-born residents as "artificial demand" is definitely a thing you can do, but it doesn't align with reality. Some portion of the foreign-born population are naturalized or are family members of US citizens, so it's not like waving your magic racist wand would actually solve the problem.