
If I'm reading this right...
The ESA say that the two telescopes are at a precise 106.5 degree angle to each other. This means they can use this as a reference point that shows where the imaged stars are _in relation to other imaged stars_. Using this data the ESA will produce a relatively accurate 3D map of star positions (and velocities) for a huge number of stars. It's not a design for stereoscopic imaging of single objects, but a method of fixing the location of objects in relation to other objects for the production of maps that can be displayed stereoscopically.
Of course, I may _not_ be reading this right...
(Sometimes I look at what humans can do with our technologies, and think "we are so cool!". Then I look to what we do to each other and other animals, and I despair. Is that just me?)