I wonder if this was a diverting aircraft asking about the METAR, possibly with some mis-communication involved.
Some operators require for planning purposes a diversion airfield to be available with an actual RVR of twice the RVR limit for the nominated approach.
1100 metres is twice 550 metres, the latter being a common minimum RVR for a Cat 1 ILS.
Once the aircraft is airborne (and diverting), the normal 550 metres RVR for the diversion airfield's approach would apply.