I am not sure about what Goldberg Sensei is demonstrating here, but i see the uke is grabbing weakly at the outset and never attempts to maintain or regain stability at any point in the demonstration, which negates the claim of using aiki to affect uke's posture. Taking uke's posture at the initial contact and exploiting uke's attempt to regain posture should be a critical component of the way of aiki in my view. I do not see that in the video posted; despite Goldberg Sensei's claim that uke is not one of his regular ukes and is thereby not complicit in the demo, the video shows otherwise.
Essentially, as long as he maintains contact kuzushi is present. In other words uke can't regain his balance.