Well, all I have heard about Robbie is NOT good news.
He may still be playing music, but he has never really sincerely left behind his jones, and actually, is still standing on his laurels about having played with Kingfish when trying to impress new people. He did some time in prison
(at the same time/place as Buddy Miles) in the late 80's got out, swore he was cleaning up, but went out & blew his tour advance money on --- guess what, more white stuff. At that point he was left behind by whatever act had taken him in to give him another chance.
Last I heard (about a year and a half ago) a friend had encountered him living in the TL here in SF.
Sad story, but they say once a junkie always one... does not seem a lot different here.