[Heresy Spoilers] Strange Dialogue from Drifter in Orbit

So I was doing the weekly story mission on my second character today, and when I was in orbit, I got some seemingly out-of-place dialogue from Drifter. It played right after I heard his normal lines for this week ("You're running with me on this hack-job.")...

I can't remember all of it exactly, but it was something pretty close to this:

"Hey, I heard what you've been hearing aboard the Dreadnought. Whispers from the dark, from the Deep? That ain't her. If Eris was alive we'd know. Let it die."

So what is this referring to? We know at the end of the weekly mission Drifter opts to leave the system, so they can't be from after the quest is completed. I've done everything else including the Barrow Dyad quest too, and at no point has anything in the game hinted to me that Eris is indeed alive (meta-knowledge from the opening cutscene notwithstanding). I've looked through what the D2 Lore Vault folks have posted on YouTube to see if I missed something, but not finding anything there either that would explain this.

So did my game just bug out and accidentally give me some dialogue from a future part of the story way early? Or has anyone heard these supposed "whispers" Drifter is talking about? Not seen anyone else mention having experienced what I did yet so figured I'd post this here to get some other opinions.