bottom line. ball is starting to come loose before his arm starts forward. it does not matter if he then pushes the ball forward and it does not even matter if it is a perfect spiral. it is loose before any forward momentum of the arm. just because it looked like a pass does not make it so. it is not hard to understand.
It is hard to understand when you talk out of your ass like you are doing. First of all, what rulebook are you using? Second of all, if you actually watch the replay, which it doesnt seem like you did, you can clearly see that in no way is the ball coming out, and then Clausen "pushes" it forward. The ball shifts in his hand, so when he threw it it was not how you would normally through a football. But last time I checked proper throwing mechanics dont usually factor in to whether a play is a fumble or not. Bottom line, as you say, is that the ball was in Clausen's hands as his arm was moving forward. It is absolutely clear as day that it was an incomplete pass.
But, to give you the benefit of the doubt, lets say that the ball came loose and Clausen pushed it forward as you say. Honestly, to prove that you arent just a troll, please tell me how the replay was CONCLUSIVE to overturn the call on the field? If you are honest with yourself and not subject to any type of hallucinagen, there is no sane way you can say that there was enough to overturn the call on the field.