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I am the author of the latest version of the "Atmora" page and I saw your edit. You updated the lore on Nede migration from Atmora to Tamriel, but didn't leave any sources. I'd be glad if you could show were did you found the information, add it to the page as well as allow me to investigate myself.
My previous assumptions were made while studying Songs of the Return book series. As the day when Five Hundred Companions left Atmora was called the Day of Final Passage, I assumed it ment that no Nedes left Atmora afterwards.
You might want to look into the "Nedes" page as well, since currently it is a complete mess. The lore written there is completely wrong and needs updating. I haven't had time to do any major edits yet.
Thank you for your job,