Well looks like they found a lot of brambles! Were there large areas without any bramble?
Cue dowsers, who successfully find water... but also who would anyway anywhere else because underground water isn't the underground river/pocket that people imagine and thus random chance by itself has high probability of finding water.
We did note several places during the trip that didn't contain bramble. The hotspot in the middle of the residential area was also entirely isolated.
For a proper evaluation you would need to be more methodological but as a sanity-check we were very happy with it.
One other thing to point out about the bramble model is that it is pixel-wise. That is each prediction is exclusively only what is within the 10 metre pixel (give or take the georeferencing error).