Given the two’s past history, it would not be all that surprising to learn this whole future Syd moment was a sham and that Farouk is manipulating David into giving him what he wants.
It appears as though David is going along with this because he trusts future Syd, although Legion fans know there’s a strong possibility that isn’t actually the future Syd.
A scene within David’s mind showed the “delusion” monster creeping around David’s subconscious, which means the Shadow King still has a small hold inside of David’s mind.
If that were true though, how does that high-tech orb play into all this?