This was literally in the article you posted above (the most recent one not from April or May). Bold Mine:
In addition to beds, a shortage of nursing staff will make handling the surge of virus cases “extraordinarily difficult for us in California,” said Carmela Coyle, the head of the California Hospital Association, which represents 400 hospitals across the state.
The number of hospital beds in California has declined over time partly because of a trend toward more outpatient care, said Kristof Stremikis, an expert on the state’s hospital system at the California Health Care Foundation. But more acute than the shortage of beds, Mr. Stremikis says, are staffing shortages, especially in regions with high concentrations of Black, Latino and Native American patients.
“The system is blinking red when it comes to the work force,” Mr. Stremikis said. “It’s nurses, doctors, allied health professionals — we don’t have enough of many different types of clinicians in California and they’re not in the right places. It’s a huge issue.”
The beds are useless without staff to man them. Earlier in the pandemic, it was easier to share resources with other states, when California was the hot spot of the nation. Now? Not so much.