That is simply not supported by either facts or law. At this speed of firing, the decision must have been made in advance. The second and third shots are not "from" the side window; they hit there as a natural consequence of continuing to fire in a burst. I see nothing to support the claim that the officer was "already out of the vehicle's way" at the time of the first shot. In fact, he was struck by the vehicle; he did not succeed in getting "out of its way" at all.
A trained LEO in a self-defense situation is expected to fire multiple shots. Even civilians learn how this works in sufficiently advanced firearms training. See for example https://en.wikipedia.org/wiki/Mozambique_drill . A failure to follow procedure here would be more consistent with "not actually self defense".