We can infer it from how it was transcribed and how related languages are pronounced. After all the game uses other medieval languages. And linguists even went quite far for ancient languages as far as proto indo-european.
Overall it would be possible to get close enough.
Alternatively for the Huns, we could fully embrace the fact that JRR Tolkien used them as a major influence for Sauron (on the other side Theoden = Theodoric the Wisigoth) and make them speak black speech. Ash nazg durbatulĂ»kâŠ
Not historical but we have to do with very limited sources 
You can tag them here on the forum, but I doubt they will respond. The Italian of the mod should probably be revised. With the Sicilian they made a excellent job (https://youtu.be/gFS0Gc0M0ys?si=DlK1E2XqAkjFx7MH&t=602), so I would say that the development team will definitely have an external team to rely on for these things.
My reasoning is basically just this:
So they should speak a language that doesnât sound like other languages. As far as I know, the AoE1 dialogue is just a made up nonsense language. (Although âerectusâ, if thatâs what theyâre saying, is presumably Latin.)
Also a great suggestion. Not sure we have the required vocabulary in the Black Speech though.
I donât think that would be allowed for copyright reasons, just like my sister-in-law, who is a fantasy author, isnât allowed to use Tolkien Elvish, because itâs a made-up language created by one person, unlike an authentic language that developed naturally over centuries.
Add Portuguese to the list too