Something doesn't add up regarding the connection between Amdapor and Norvrandt...

[Ouen]

Personally I don't think they're based on sin eaters but it is possible that the white magic they used lead to them encountering something similar.

I'll post the quote that is in my OP again.

Q17:
In the Eorzea Encyclopedia II it mentions that the statues found within Amdapor were made in the image of transcendent beings from yet another plane. Was this referring to the Sin Eaters from the First?

A17:
In the sense of "if you look back at the Lore book, you notice certain things," we did this intentionally.

I'm not using their coincidental appearance to come up with a guess. Yoshida's response is confirmation. If it was not true, he would not have given the answer he did. Here's a rephrasing of the quote that might make it clearer.

"In EE2, we indeed purposefully wrote that Amdapor's guardians 'were made in the image of transcendent beings from another plane,' and we deliberately wanted players to return to the lore book after Shadowbringers and make 'certain' connections."