As stated on an earlier topic, although the GE90-115B had a good first 3 years with no IFSD, they have now had 5 in the last 5 months. This burst of failures gives an approximate IFSD rate of
5*1000/(115*2*10*30*5) = 0.015/1000 Engine flight hours
Now this on the face of it is still below the (0.02) 180 ETOPS guidelines, although close to the 330 mins.
I believe this is the first AF IFSD, and therefore they may be taking a conservative approach in limiting ETOPS in light of the recent burst of 5 fleet IFSDs, the last (AF) one of which appears to be something of a more serious failure.
Perhaps Air France/authorities must be concerned over this recent St Petersburg failure - that it could be a problem they can not easily manage their way through, or just don't fully understand yet.