That's complete nonsense. First: Why is there a timer at all? Why is there a 15 second cool down when you are in combat when they could just disable menu logging until you are dead? Second: Sandro is referring to combat logging as ungraceful exit (pulling the plug, killing the task), he is NOT talking about logging to the menu.
Third: On the bolded part, nope, I don't need to face a rebuy if I survive 15 seconds (just hypothetically, I don't combat log...), cause that's how the game is currently designed, which is what people want to change here.
There are ways to disrupt a high wake 15 second countdown, pirates utilize FSD disruption weaponry all the time if a transport needs extra convincing on why they should dump cargo. Unless you are referring to the 15 second menu option, which is still combat logging, even if 'legal'. Doing such too often is a quick way to get listed as kill on sight, and for pirates this results in an immediate hatchbreaker on interdict to ensure that you'll still spill cargo just in case.