Yes the system maps the surrounding to sounds, i.e., it is a sonfication system.
The big question is: how to effectively and meaningfully map a complex, dynamic visual scene (the immediate world around a person) to sounds such that it makes sense to the listener and communicates useful information?
There is a good amount of research to show that, especially those who are blind from birth, have a very distinct and unique perception on the physical world; consequently a mapping that may work for a sighted person may not be any help to a visually impaired user.
There have been a number of such systems developed in the past: some based on raster scanning, mapping snapshots of the current scene to a soundscape, and others that attempt to do qualitative analysis of scene images and express these with mappings developed in conjunction with visually impaired users. In all cases the issue is mapping images to sound in such a way as makes sense to a person who has never been able to see.