The media is part of the problem here. The dramatic claims that it can’t talk about the video while standing there talking about it and showing LE in the garage clips. Interviewing the neighbor twice. Giving SM a platform and giving her cues/finishing her sentences for her.
The video stills don’t say anything to me other than the media needed to have some visual bait for the public. What the neighbor said is what points to something substantive.
We don’t even know if what he saw became of even greater import to him after he showed it to Dad, because Dad saw more than the neighbor due to context or other information only family would recognize. But it’s clear enough that what the neighbor saw was alarming to him. So the chances of some element of the crime in process emerging on that video seem high to me, no matter what the details.