It is very clear. On the field, the ref called it incomplete and blew it dead when the ball hit grass. The play was then reviewed. The play was ruled a fumble. BY NFL RULES, when a play is blown dead as an incomplete pass, but later reviewed to be a fumble, the ball is given back to the team that fumbled it at the place it landed. It’s simply a rule, just like if a player grabs your face mask, it is a penalty. No one is claiming that it wasn’t a fumble. The NFL’s rule may not be the fairest thing in the world, but the idea behind it is that once a play is blow dead, you cannot go back and review what happened after the whistle because the whistle means STOP PLAYING, and that’s what players do when they hear it, otherwise they might get an unsportsmanlike conduct penalty.