As you know, headlines are often not written by the authors of the work themselves. And even if it was, she actually did answer legal questions sufficiently while adding her own opinions which you can disagree with.
In racial discrimination cases, especially in employment discrimination, you don't need a concrete admission of racial prejudice or discrimination (because it almost never happens that easily), but you can use evidence of past actions to show the reason given for what the plaintiff is arguing is discriminatory action is actually a pretext for racial discrimination. So in case where racial discrimination is relevant, a good attorney on cross would bring the department's history of racism up and ask if Ms. Bland's race played a part into the way he conducted himself during her traffic stop and arrest. Of course, a smart witness would simply deny. But because the attorney brought it up during the trial, she can definitely use it again for closing arguments if the narrative of the case related on racial discrimination and the actions of the officers involved.
I'm not saying this article was unbiased or that she obviously has a side picked. However, I don't think the attorney in question made any illusions that she wasn't picking a side. The actual black letter law questions she answered were solid and helpful. Everything else, I just took to be her own views of the facts that occurred. As an attorney, we always look at the facts from both sides, but looking at the facts, history of conduct (like this officer's history), and actions raises narratives that lead to logical (if arguable) inferences. That's part of legal work too.
I took the work as separate entities and am able to see where she stuck to answering legal doctrine and where she ended up narrating. I don't think the parts that stuck to answering questions like how the Supreme Court ruled that cops can arrest someone for traffic violations, or the differences between being detained/arrested, or anything like that is really impacted by her pro-Bland is a victim of racial discrimination bias.
Sure, if you were on a jury and she was called to testify, she could be impeached and her truthfulness would be in question, but I think it would be foolhardy to simply disregard the whole thing or call it a failure because of some conclusions she came up with rather than actually looking at all of her points and seeing which ones actually answered the questions answered and stuck. Even in Supreme Court opinions that I ultimately disagree with, there are always things in there I either have to concede with or realize the Justice has legal support. I think if she failed to answer substantive law, then yes, the article was a failure, but for embellishing her legal answers with her opinion, it may not be the best thing to do as it may prove distracting for some people, but she did not fail in answering legal questions. I also think the whole neutral/bias dichotomy in terms of answer legal questions is sort of false as well because some times picking a neutral sound is actually adopting the status-quo perception of how things went on. Maybe it would have been better if she said, "if one were to see the officers actions as racially discriminatory, then he would not have..."