This is a simpler and more efficient design.
There's really no benefit, per say. However when I built my room with two Dead Vents one of them has a 15' flex running to another corner of the room just as you've described.
The essential realization is that (except for the very high frequencies) sound waves will not follow the route of the flex. The low mass flex will not contain a sound wave. The sound wave will immediately pass through the acoustically transparent flex and start interacting with the insulation. This is why the DV is short and wide, while the soffit muffler is long and thin. Both have a great deal of absorptive volume.