portmanteau, # 1063.
One problem with using so called sources of accident data is that there is no explanation of what 'human error' means, nor how such a classification can 'cause' an accident. Thus most of what is quoted is of little use for improving safety.
For a mechanical failure, fix the mechanics, for a human 'failure', fix what, how ...
For this accident, if the GA system design contributed, is this the major contributor, or is the human because of the weakness in system operation, or jointly; or due to documentation, certification, ... etc. Like many recent accidents this one has the potential for similar complexity. It's not what caused it, it is why the contributions came together at the time, and how we can learn from this will be the important aspect for safety.