You can fly an approach to the outer marker or equivilant position and if the reported RVR is below that required then the approach must be discontinued. However if the RVR is the same or greater than that required the approach can be continued down to DA/MDA. A landing can still legaly be carried out if the required visual refrences are observed even if the RVR is below minimums.
Therefore from the original post if the RVRs were as reported at the outer marker then no you cannot continue the approach. If however the crew recieved actual RVS within limits then yes they could land legaly.
Without listening to the tapes you will not be able to tell as the RVR can vary minute by minute and thus will not be reflected in Metars and TAF's.
Hope this helps