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Similar thing happened to me first time on Eos. I went "the wrong way" and activated first glyph mission before I even heard about the Remnant. (I literaly didn't hear about them before, being a total spoilerphobe... 🙂). And suddenly Ryder started talking about them like they're nothing new.
For the longest time I thought it was because I missed something. At that time I played the game with English VO and Polish text and it was difficult to combine. Now I know it was because dear devs didn't account for people actually making use of this open world...
My first contact with an Architect was at Voeurl ... or whichever the name of the ice world is. I ended up not fighting it on Eos. Then, I found the thing flying around the blizzard and Cora yelled "Architect!", then I asked her: "How do you know?" She didn't reply.