not necessarily; maybe it means he has found a synthethic drug that isn't detected, is using a new masking agent, has gotten lucky, or has failed a test that we don't know about.
But that's not the point; Goodell looked at ADP and said, "yeah, the courts acknowledged that it wasn't child abuse, and what you did, to many people, isn't a big deal, and you've acknowledged that you made a mistake, but since I don't feel that you have really changed (won't change the way you parent), I'm going to continue your suspension."
He could just as easily say to Gordon "you've had no failed drug tests in the last (however long it's been), and only got the permanent suspension because you drank a beer after the season ended (and thought it was allowed), but since you're still hanging out in Vegas, with another suspected substance abuser, I don't think you've changed, so I'm not going to reinstate you."
It wouldn't be fair, but it wouldn't be a total surprise either, based on Goodell's past history.