Yes, quite confusing, I guess, but the region in db shows the region of the release, not the internal region encoding. Like, http://redump.org/disc/31187/ is JTUBKAEL (Japan, Taiwan, USA, Brazil, Korea, Asia, Europe, Latin America), so it's "World" from the region-lock's point of view, but that disc with that ringcode was only sold in Europe, so it's (Europe), not (World).
So I think they would all need to be fixed?
Most likely (unless the same disc of the same version was really released in all 3 regions, it is possible). Should be more or less safe to judge by the barcodes, I think.
Btw, have you ever seen the Splinter Cell's demo packed the similar way? I can't find any good photos, only this small one: http://i494.photobucket.com/albums/rr30 … IM0923.jpg