I’m genuinely sorry for the misunderstandings happening on your post, Reikon! I didn’t mean to stir the pot. I was merely trying to keep things organized. Really, I’m sorry. Let’s get back to your original thought, yeah? Because I believe it deserves to be discussed.
I remember seeing this dialog once before. I didn’t think much of it. But you bring up a good point. How are we (humans) even supposed to understand the aliens unless we somehow were taken as Echoes? It’s then reason to believe that the Korvax are scavengers of information. I mean, they get pretty excited when they see the Traveller. (this is also a good reason to speculate that Polo is a SynthGek) What if they also scavenge other species as well? Then they would know the Vy’keen and Gek languages. What I don’t get is why don’t they have a clue about the Atlas? They see it as this omnipotent god with all the knowledge they desire. I feel like there’s lore to explain their fascination…
It’s also noted in many other dialogs that the player can understand the alien because they are speaking our tongue. So some aliens are multi-lingual. Cool. I think this might be a design choice to avoid players getting super lost when trading with other NPCs.
The monoliths also carry some sort of supernatural power that presents itself when the Traveller approaches. Visions are seen, gifts are presented, pleas and cries are heard, all engaging the Traveller to do something. Other dialogs with Korvax that I’ve encountered in buildings have tried to examine me, poking and prodding needles and scanners. They are always trying to figure things out, and get answers from the Traveller.
My home planet was in a Korvax system and I spend quite a bit of time there. lol. So they were the first species I encountered and the first bit of lore I experienced. That’s not to say I’m an expert, but that I just love them. 
I for one believe it’s definitely a Korvx/Portal backstory/present story, and am excited to see where it goes!
Again, truly sorry for the previous negligence to your thoughts. 