To be clear, the leaks I know about are just saying that Afrasiabi planned and insisted on the burning of Teldrassil, nothing about what the story was originally supposed to be before that. The YouTubers who talked about it were Taliesin (of Taliesin & Evitel) and Bellular; there may have been others as well.
Taliesin’s video (with quotes from the texts he received) is linked in this thread:
And here’s a link to Bellular’s video: https://www.youtube.com/watch?v=24dtddMT07k
This thread also has links to some relevant tweets: