I never really played the, but know they were (and today are the Ossetians) an iranic people, an Iranic European ethnic group.
I was surprised that their rosters and garissons were either hunnic or germanic.
Its like with the Iberians (the real ones, not the caucasus ones) they were give unique units but very poorly designed (for the ones who have no armour and in all total war games have no bowmen).
I think CA does a crappy job when its about lesser known cultures.
In ROR (Rise of the Republic) the Nuragic units description have Rome 2 pre-dlc unit historic description).
In Empire divided the Persian Satrapies are easily recogizable of their rosters, youl expect Baktria to have an Hellenic flavour but no its generic easterners.

can you fix the garrisons I mean most of them have germanics for garrisons.

does it do garrison units?

I don't use that mod, but if it uses vanilla factions and doesn't overwrite the parts of tables I changed then it should.
at worst make a backup save and give it a try.

is this for medieval 1212?

I like this, many factions in attila wasn't fleshed out as much

This, This is based.

Perchance you'll rewrite the description with grammar?