Of course the ATCO really meant to say 'KLM.... you are advised that the current RVR is 600m which is below the absolute minima for a (name) approach to runway (number). What are you intentions?'
If the pilot then asked what that minima was, the ATCo would say that ATC are unable to supply this information to pilots and that they should refer to his Mandatory Aerodrome Operating Minima.
As per Amendment 69 Section 3 Chapter 1 Page 7 and 8.
I deserve that!