Well, it is BARD, so take it with a grain of salt, anyway.
It can't be the 1248 codes, because that had to have been created long before 1248 ever got moving.
It can't be alien codes, because it is former Lucan Imperial territory. Those all used human codes. (Except for any random Droyne world which may or may not be present.)
TNE did introduce two sets of government codes. One set was the traditional set, to be used in established areas (e.g. RC, Regency). The other set was to be used in the Wilds. However, I thought the Wilds codes use the traditional range, too.
(BTW, the "B" travel zone means the world is balkanized, like the traditional government code 7. The government code shows the government code of the primary country on the world.)
Also, did you check other BARD pages, or any of the top level stuff? It might explain any non-standard stuff that is being used.