It's not even correct for one bedroom where the author noted $1200/month which would be $14,400.
It's also, frankly, just plain wrong. Just because a 4 bedroom house has 4 bedrooms doesn't mean people are renting those bedrooms out at that price.
The actual average rent for a 1-bedroom in San Jose is $2,150 / month which is $25,800 / year.
It's a shame this author has so many basic mistakes in their post as otherwise it is a valid discussion.