What they? GPS data or RSBN data? As per the "interview", the Polish crew used at least some GPS coordinates (the interviewee seems to refer to at least the airport reference point). But I strongly doubt they used RSBN — it has never been mentioned either by MAK or by anybody else, and, most probably, the on–board RSBN equipment wasn't there, anyway.
So to recap what my problem with this all is:
it's an idiotic thing to use GPS coordinates from the charts of an airfield that was never properly surveyed and certified for GPS approaches in a country that didn't even have procedures for said certification until very recently (if ever). Particularly if these data are not from the field's approach plates and contradict other data on the charts. So either the "interview" is a crock, or those pilots are truly idiots.