The silhouettes of the leaders of these warcry warbands were initially thought by many, including myself, to be pity heroes for upcoming khorne and slaanesh aos releases, in accordance with the big 4chan rumor pile from a while back. That this was not the case doesn't disprove those rumors, but now that the seraphon release wave has been previewed, I don't think that lines up with the predicted releases either? Hard to say, I didn't save the whole pile, just the undead stuff, and now I can't find the source. If I'm right and the seraphon releases don't fit, then the reliability of the entire pile goes from pretty high to fairly low.
That said, the rumor pile not panning out isn't necessarily a good thing. While the rumor pile didn't predict a lot for death, it did predict more than just the lcd pity hero for FEC, plus an otherwise unexpected book update & a couple releases for Gravelords. 2023 is a crowded release year already, especially if you factor in 40k, where we're getting world eaters, expecting a major dark angels release, plus 10th edition. If the rumors can no longer be trusted, I think we're back to expecting mostly copy-paste books plus a pity hero only for FEC & OBR as the only main game AoS death releases this year.