Not at all — it is consistent with his statement which is found here:
What the girl calls “grabbing him by the neck” Johnson calls a “headlock”.
Thus you have corroboration of what happened—
friend said the officer threw open the door which slammed closed again after bouncing off Brown. It was then that the officer grabbed his friend by the neck. He told MSNBC today: 'The time frame was 60 seconds or less, it got out of hand really quickly.'
Mr. Johnson clearly states that the door was closed, the officer was still in the car when he grabs Mr. Brown. In this version he says the door only hits Mr. Brown. Mr. Johnson is probably telling the beginning, and the ending,
but Scoutmaster's post - the officer was out of the car, put Brown in a restraining hold and moved back towards the vehicle, is probably the middle part that Mr. Johnson is not going to admit until hell freezes over.