I would suggest that it's just a misunderstanding of "San Francisco" vs. the "San Francisco Bay Area," but then I'd expect pictures of other bay area places.

I'm not even really sure what these pictures are trying to say, anyways. I don't live in SF, but I've been there a lot, and these pictures don't look much more different from current reality than most large cities between mid-20th century and early 21st. If anything, it may be distinctly less different looking than most.