Well, I'm not going to say you don't have a point, because I don't know how they plan to implement it.Space is vast. Everything is moving. At interplanetary, much less interstellar distances, travel lanes are impossibly large.
While you might be able to mine minute areas to protect a specific target, a dedicated ship for that seems rather wasteful.
It could be the 24 mines this thing carries strung out over a grid of 2400 square KM sets up a distortion grid between the mines, that disable anything that flies into the net then all fly toward that target at 1000m/s, detonating as they reach the destination in a glorious deathblossom.
Could be a cap-ship killer. Again just theorycraft but it's not outside of the realms of possibility.