Obviously not, but he really really wants to destroy the Waystone Project, so when he comes up with the idea of doing one of his famous standard gambits, but needs the Druuchi to do the footwork, he calls Slaanesh (who also wants to destroy the Waystone Project, and may hate Mathilde personally because of that time we stole a Karak) who calls Morathi. Morathi says 'sorry, I didn't listen to anything you said after "fuck up Ulthuan", I was too busy fucking up Ulthuan' and soon enough this delegation arrives.Tzeentch isn't really involved with the Dark Elves, canonically.
Because the Chaos Gods do work together when they feel like they might lose something they care about. And our whole goal is to cause them losses they'd care about.
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