May not be that bad. If the HF tweeter is disconnected inside, it will have HF disappear so music playback become 折聲。If no more warranty, you can remove the screw and tweeter and see if the internal connection is disconnected due to the fallen incident. It can be reconnected easily.
kEF's central tweeter has suspensions to hold tweeter in perfect central position so that both the mid-range driver and tweeter can playback music smoothly in it's Uni-Q design.
it seems like one of your suspension is loosen and the tweeter is touching the mid-range driver. You should try to check by your self. Very possible to fix it by your self.