Type C, USB 3.1 Gen2, Alternate Mode, and USB Power Delivery are not explicitely linked. A given port can support various combinations of the 4. e.g:
You can have a Type C port that is basic USB 2.0, without power delivery, alternate modes, etc.
You can have a USB Type A port that supports USB 3.1 Gen2 speeds and USB Power Delivery (but not Power Delivery 2.0) up to 100W in preset voltage steps, but no Alternate Modes.
You can have a USB Type C port that supports USB 3.1, Alternate Modes (of which it can support an undefined number and type of modes), but not USB Power Delivery (2.0).
By way of example: the Type C port on the back of the Gigabyte GA-Z170N-Gaming 5 currently works the same as the Type A USB 3.1 Gen2 port. But in the future, the Type C port might support Thunderbolt through Alternate Mode (which the Typa A cannot). Neither port supports USB Power Delivery.