The foreign dex feature doesn't exist in B/W; if it did, the English names would have been found already, as the text encoding was figured out a while back. I don't think Game Freak would have used a completely different method of encoding text solely for English dex entries.I think the guy was referring to the "international pokedex" option, how after D/P it was expanded to all Pokemon in the game, not just the 20 or so it was in D/P. In theory, they could have left in this feature. However, as the people translating haven't found this text yet, we should assume it doesn't exist for the moment.
*EDIT* Actually, there's an easy way to test this. Set something's region to North America and trade it to someone. Then, check that Pokemon's pokedex entry.