The way that Destin described "revoking access" in his original video is misleading enough that I think it warrants an actual retraction.

As Drew points out, the thing that he described is clearly not possible, thanks to the "analog hole" (or even an equivalent "digital hole" -- if the protocol is open source, there's nothing stopping me from creating a fork of their software that logs everything it ever sees).

Closing the analog hole is impossible. Closing the digital hole would require some sort of DRM, which is definitely counterproductive, and most likely ineffective.