i did not know either
really is only a list of possible infection routes and what you plan to do about it
ie
site to site transmission :: Sanitise hands with appropriate alcohol when leaving vehicle
within site transmission : always wear a mask while on site, get staff to open all doors where possible, get staff to keep residents at a safe distance
etc etc
it covers their back in as much as they can say they took every precaution and made sure every visitor was aware of their responsibility
that was my take on it anyway, others may differ
Dave