The article is just click bait and dishonest talking about a plunge. Only thing really going down is bay area and NYC, and only after years of nosebleed increases.
The data tables are interesting though. The last 5 years San Diego has had below average rent growth and now is a pretty good deal. We are cheaper than Miami Chicago and Seattle and about the same as some places like New Orleans, Portland, Denver and Minneapolis.
Over time I bet some back office tech work moves here from the bay area. Talented people are willing to live here and it is just an hour flight with 25 flights a day between SAN and the bay area airports. I do day only trips up there about 15 times a year, go up at 7am go home at 7pm.