That’s the correct explanation. Michael Jace, former star on The Shield (who murdered his wife in 2014) is also serving his life sentence at Corcoran. They’re both considered “high profile” inmates and Corcoran State Prison’s Level IV housing and protective custody units are set up to handle these type of inmates whose fame and notoriety make it dangerous for them to be in gen pop.
Other notable inmates: Charles Manson, Rodney Alcala (The Dating Game Killer), and Sirhan Sirhan (assassinated RFK)