"Absurdly Cheap" compared with what?
They give desal cost (not final price!) as USD 0,75 / m3.
USD 250 / acre-foot for delivered water in the San Joaquin Valley is USD 0,20 / m3.
So I'll grant them "cheap", but at more than 3x, defo not "absurdly" so.
https://water.ca.gov/-/media/DWR-Website/Web-Pages/News/File...