This is a bit of a myopic view isn't it? Given that these treaties often force Most Favored Nation status on the participants, the end result is lower tariffs overall (if only that they can't make it worse), so pro-free-trade
Given its strategic nature its role is to protect both Western powers and regional countries that want investment from the West and to grow against the rise of China.
Since it protects 40% of the world GDP at the explicit and planned sacrifice of other nations and because it is used to instantiate international laws that protect those same countries I call it protectionist. And if you look at the leaked memos it's really not so big a stretch. It's also been called protectionist by people not aware of its strategic value (e.g. Assange).