This is the Carmela POV shot straight from the link:
I don't know how you see that and think "Can't be his POV". I don't think you need to see the top of the booth in front of you to know that this is what Tony is looking at.
...because he was dead, you don't see anything when you're dead.
Except lots of people died that way, and they spent lots of time foreshadowing by talking about it and showing it. Tony and Bobby on the boat, Silvio's dinner, Phil's death, Bobby's death....all in that same season, all all unaware, all never saw it coming. They even spent time showing you how Tony was not paying attention to things behind him in the scene immediately preceding the diner (and they used the same POV process)
So while they cut to Meadow parking, AJ took his jacket off. I'm missing you here, how does this affect the theory that Tony was killed?
The Sopranos Final Scene
Again, I'm not following. The show MOG walk past Tony to establish that he has a clear shot of Tony from behind as he exits the bathroom. Moments pass, Tony doesn't look at the bathroom again, or check behind him or anything like that. The bell rings, Tony looks up at the door again, instead of seeing Meadow they hard cut to black.