No one lists SSM as the developer for Journey alongside Thatgamecompany. Being under an exclusive contract with Sony is probably why SSM contirbuted through its development phase for technical issues or whatever.
But yeah, its just you. Journey is considered an indie game by the critics. Doesn't matter what your own definition is.
If this is your logic, PlayStation All Star Battle Royale might be considered an indie title because Sony hired a developer to work on it along with help from SSM and later Sony Santa Monica took charge of the game updates and DLCs.
Without the help of Sony Santa Monica, there would have been no Journey. No matter how hard you try to pass it off as some "indie" game, it isn't.
* Phyre Engine is exclusively developed by Sony for multiplatform development exclusive to their eco-system. It was the backbone of development for Journey.
* Sony Santa Monica helped create the engine, the graphics and especially utilizing the PS3 effectively for all the sand effects and awesomeness. It wasn't the work of thatgamecompany. It doesn't matter if others don't see it but it is a fact that Journey was a co-development effort between SSM and thatgamecompany and not their own "individual" effort.
SSM helped in the development and programming of Journey, how is that not considered co-development is beyond me. It is not a simple "publishing" job or sole effort of thatgamecompany. Heck in the credits, their name is listed even before thatgamecompany.
If you think that the $15 price point is enough to label it "indie" like [MENTION=1226]faraany3k[/MENTION], then i don't even know what to say here.