The point was that, in the clarification, he explains that each step of the Apple TV interface was a step forward, but the original tweet strongly suggests that he thinks the interface is worse now.
For me, the original tweet only suggests that he tried now to get some credit for something he did in 2007 an what was rejected. The bad thing is, what we see now is not what he did in 2007, he only did something "similar." The differences alone could be good enough reason for his work to get rejected, and he even himself now clarifies that the context is even more important.
Margolis adds that he no longer owns any Apple stock and hasn’t been employed by the company since 2008.
Having not worked there since 2008, he's not in the position to make that comment. It sounds like he was just venting or speculating, perhaps.