In about an hour and a half after fifteen "Liberate Liquor" missions I found the correct POI with two skimmers, one data port was buried, the other available. (So you have to be patient to find it!)
BUT... I think there is a problem here.
It's no longer about the SDP, but a POI generated by a Horizon mission with a duration of 4 to 7 days without enemies that generates an SEC data port in the middle of nowhere, which keeps churning out SDP, Manufacturing Instruction, Ballistic Data, Patrol Routes, Operation Manual, tons of Surveillance/Maintenance Log, unbelievable, just stand in front of it go back to the main menu and it starts again.
Let's hope the FDevs don't notice, we'll have to keep it a secret to ourselves.