He was not still to ensure millimetric accuracy to the shooter. If you watch he and his head was continuously moving during the speech. The bestest of shooter cannot guarantee that there won't be error of 2 mm. Not even in 10 m rifel shoot. The shoot got killed, one of the supporter next to trump got killed few injured. It is not deepfake but live.

So one bullet actually hit him in chest. Bullet proof jacket below saved him.