It's incorrect to generalize like this. NPCs maybe use broad procedural rules, full mocap or really anything in between.
Yes, this could apply to them. No, it doesn't mean it always does.
This also doesn't really add to the point that it wouldn't be suited to human conversation. You rarely use NPCs to have human like chats, especially for several minutes. The few games that do would be Mass Effect or LA Noire, both of which use mocap to avoid the effect I'm referring to.
