The data is interest (all data is interesting). Given the commentary provided by WGC in the notes, I am not sure that it should be too heavily relied upon. Central banks are very secretive about open market activities, so this data is almost certainly anacdotal in source and therefore incomplete. Even if accepted at face value, I don't think that it can be used to support the idea that the Europeans are accumulating gold in anticipation of migrating to gold based currency.