Not only that, but these intensive care beds need to be isolated. Ever been to an ICU? Isolation is not a thing. We can't just go in and tape a bunch of plastic drapes to the walls/ceilings/floors and make these ICU beds isolated. 400 ICU beds is to a first approximation zero isolated ICU beds.
Well theatres can be used instead which will allow for isolation. In reality the main HDU or ITU will become covid zone and theatres used for non Covid admissions.