I've seen at least three of these "Convoy Dispersal something signal', Threat 4." in the systems around Deciat yesterday. Flying a mining type 6, so didn't stop by..
I've found and checked many of them as well, but not every one of them was "this one". The Medical Convoy with the old chatter is still in game and it spawns inside these Threat 4 Convoys. It seems that the Threat 4 is something similar to the old Strong Signal Source.
It seems we have to get the right one. It could even have two or more different ship compositions, like for the UA, where the convoys where not all the same, apart from the T-9 that was holding the UA, and here the Python.