Yeah I just assumed that he knows what the Orchid is. God knows how
but he I gathered that he knew that the island was going to move. He wanted Miles and Charlotte to get off because once it moved he knew that would be it and they wouldn't be able to leave (hence the forever bit). I wouldn't be surprised if Daniel knew every little thing about that island. He just wants to get a crack on a tell everyone
Although I am a little bemused to where him and his redshirt boatparty disappeared off to
