Because all those were included in vanilla from the beginning...
Not sure what you're point is? He said at this point, not in the beginning. He's basically saying, I think, that we've gotten almost an expansion worth of content through DLC.
Civ 4: Warlords
A new category of Great People known as "Great Generals";
The ability to institute vassal states;
Eight new scenarios
Six new civilizations playable in single-player and multiplayer;
Ten new leaders (including new leaders for existing civilizations);
Three new leader traits (Charismatic, Protective and Imperialistic);
Unique buildings for each civilization;
Three new wonders;
New units, resources, and improvements;
Core gameplay tweaks and additions;
Everything in bold or italics we have gotten some or all of through DLC and patches.
6 new civs? Check.
New scenarios? Check.
New leaders (only on the 6 new civs)? Check.
New wonders? Check.
New units (UUs), resources (stone)? Check. Still waiting for improvements.
Gameplay tweaks and addition? Check.*
Memory doesn't serve me well, but I feel like the patches in Civ 5 have been far more game changing then they were in Civ 4. Perhaps that is due to the game needing more changing, but still, the point is we've gotten close to an expansion worth of content.
As far as price goes, Warlords was $29.99? We've had two $7.50 combo packs and 3 $5 packs for a total of $30. This isn't including the various map packs which people may or may not have decided to buy. As far as I know they weren't nearly as popular so I'm not including them. So maybe we've gotten slightly less for the same price. Adjusted for inflation it's really not that much a difference, depending on how you quantify the patches and getting the Mongols/Ghengis scenario for free.