He is using indirect game.
Indirect Game: The type of game that encompasses seduction techniques where the PUA does not convey direct interest in the target right away. Interest is given as she has demonstrates enough value relative to the PUA’s DHVs and passive value.
More here:
http://www.pualingo.com/pua-definitions/indirect-game/
Direct Game: An approach to pickup where the PUA shows direct interest in a target, rather than hiding or implicitly stating his intentions, as in indirect game.
More here:
http://www.pualingo.com/pua-definitions/direct-game/
In a nutshell, when you don't show your intention is indirect such as opinion openers (the ones that Mystery teaches) and when you show your interest right away (I wanted to talk to you... * Direct Opener) it's Direct Game.
Just a small note: Mystery Method is Indirect Game oriented although in the later versions of the MM company they now include Direct Openers, but they still teach that you should wait until she showed interest to start showing interest in her.