When I was doing my research on this, there were some posters who reported back that their dealer told them "........missing seal(s) in rear fender well." Whether that means the seal around the cable you mentioned (not familiar with that) or it means some larger seal around the major splash panels is anybody's guess.
There is a lot of water flying and splattering all over the place up in a fender well.
I also suspect that the previous owner didn't take a lot of road trips in inclement weather and may have kept the SRX garaged a lot of the time. The reason I say that is that when one is approaching 90 years old they have a tendency to stay at home during the inclement weather rather than fight the elements.