What about the other people claiming to be SDC in that forum? I got interested in this because of someone claiming to be SDC was at a location where SDC had claimed to be attacking defenseless ships for some reason and that one claiming to be SDC himself had shields that would not go down, to the point that he ignored the station's defenses. I tracked his in game name to that forum where I found others claiming to be SDC.That guy isn't SDC. We know who he is and that players (at least to my knowledge) was never affiliated with SDC.
It's true that I can't tell what a "true" member of SDC is from someone simply claiming to be SDC, but if they're doing the exact same thing in the exact same place in the same way, it's hard to tell.
And "no true SDC cheats" is a "no true scotsman", if they're kicked out the moment they're found cheating that still would leave the time before they were found out where they were within SDC's graces.