Earlier quoted context omitted.
I think their point was that there are very few jobs even in the bay area paying $300k or more.
There are more jobs paying $300K+ than there are qualified candidates for them otherwise there wouldn't be thousands of job openings for them at any given time.
I rarely see listing that advertise $300k salaries. Where are these thousands of listings? Additionally, many companies leave up listings permanently so they can build up databases of resumes in case they might need you later.