My understanding is that it's an accumulation of "disconnects in instance with other CMDR"
There was a big noise made about Frontier not investigating Combat Loggers, but my understanding is that the CMDRs who did it deliberately to try to trigger a shadow ban are also frequent PvP players so they would have an accumulation of "shared instance with other CMDR" flags. I doubt Frontier keeps records of each disconnect, just adds another drop to the appropriate bucket.
There was a big noise made about Frontier not investigating Combat Loggers, but my understanding is that the CMDRs who did it deliberately to try to trigger a shadow ban are also frequent PvP players so they would have an accumulation of "shared instance with other CMDR" flags. I doubt Frontier keeps records of each disconnect, just adds another drop to the appropriate bucket.