I don't think that they are setting out specifically to make an anti-Dragon Age 2, but there is a certain alignment of motives.
Think about it this way: Bioware designed and marketed Dragon Age: Origins as a "spiritual successor to Baldur's Gate." That did not mean trying to make a game directly in the older style, but trying to create a modernized version of the same type of game. They did so to immense critical success, but for reasons I will not speculate on, decided that they need to change many aspects of that direction for Dragon Age 2. So, they moved away from that direction.
On the other hand, Project Eternity is trying to invoke the feeling of the old Infinity Engine games, and probably go further in that direction than Dragon Age: Origins did. So, essentially, Obsidian is moving in the opposite to the one Bioware chose to take. Consequently, Project Eternity starts to sound like an anti-Dragon Age 2, but I doubt that Obsidian developers are reacting specifically to any one game, but rather to industry trends and their own personal preferences.