I suspect the only thing sinking him is his admission he wanted a better lie, and then dropped 2 yards behind the original spot.
Had he dropped closer to the original lie, and it rolled under 2 yds, but placing the dropped lie closer to the pin than the original lie, then he would have been required to redrop.
Then he could have dropped from up to 2 yards behind the ball with the fairway sloping towards the pin, and played from the dropped lie.
I suspect Tiger was just in the habit of dropping behind the ball by 2 yds and in doing so was looking for the better placement.
I’m still unclear about his using his club to improve the area of swing behind the ball.
I always play by the rules.