There is perspective, so it's 3D. Unless you are talking about the fact that your display can show only 2D images then you are technically correct since most displays are not 3D displays.
I think you're right, its a sort of pseudo3d. Its a 3D presentation of a 1D (2D environment) perspective. Cut a horizontal row of pixels from the center of the screen and you have its flatland point of view.
