Duple and the Cassettes?

So the order of the websites to go live, based on the first pdf is echo, multiverse, myriad, superlumina, and atlas. If you take the numbers associated with those sites and convert you get “duple.” Seems like a nonsense word but:

Could this link back to the cassettes?

If this has already been posted, can you tell me where? I feel like there is something here.

Duple itself gets first mentioned here: https://forums.etarc.org/t/pdf-investigation/87
Further cassettes analysis here: https://forums.etarc.org/t/the-cassettes-are-not-what-we-think-they-are-x-post-from-r-nomansskythegame/532

So far no solid proof of what it is supposed to mean, but if you got a specific suggestion, either of those topics would welcome it.

Thanks for the links!