Just not true.
How can you say Ben didn't slide the ball across the line after he was down? Perhaps you are referring to a different game?
You are entitled to your opinion. It is just contradicted by the evidence and logic. Spotting the football is not a science. Most spots on any given play is off by a foot or so. Why can't you just accept that? The ref was fooled. It was a good move by Ben to scoot the ball over the line. Nothing wrong with that. It was Seattle's fault for letting the Steelers get that close in the first place. You can't fault the ref for making a human judgement.