is that they are not going to manever the whole constellation of satellites to point it in a different direction, but that they will need equipment and software on some central data collection point to correct
for different directions the array is looking at (which will alter the effective geometry). Think of the Arecibo telescope, which can look in different directions by moving the detector at the focus even though the dish is fixed in the ground. Or a phased array or synthetic aperture radar that can sweep a beam without any moving parts.

I'm speculating a lot here, because this sounds like really sophisticated tech and I'm not familiar with it. But I suppose the four telescope satellites act as "slits", which when ysed in different combination can give different baselines and different viewing directions. The fifth bird plays the role of the sensor, the photographic plate or phosphor screen in a traditional interferometer.