That seems the most likely. I have no idea why the loons want to protest this, unless they hadn't seen the video, and just bough into the common narrative.
The lawyer is question seems to be a professional protestor - A quick look at her Twitter posts shows a women that seem injustice everywhere. And she's obviously got a thing for Kapernick.
The incident occurred on Sept 15th, and the story came out on the 25th, so probably she's moved on to the next injustice. The NY Post was probably be generous by even giving print space to this lone crusader. One can surmise that anyone sane would be siding with the LEO in this case.
It's sad that some folks (e.g. this lawyer) can only see, "white cop kills black man - obviously racist". The racism I see is a woman that has judged a man's soul strictly based on the color of his skin and the uniform he wears.