"Completely avoidable" is a strong word to use considering we don't know anything of what's happened, obviously mechanical failure looking at the video, however, till a official report is released stating the cause of failure it's all just guess work.
Check out the park, it looks a lot better than Uzbekistan park that had a similar incident, but you can see it clearly lacks the maintenance a ride like this requires.
After looking at a number of different news articles about the incident. (May or may not be the most reliable source). It looks to be a maintenance issue and a licensing issue.
Surely a ride that isn't licenced won't receive the correct parts it needs to be maintained?
For this instance, it doesn't seem as though the arm itself broke, more like the components used to piece the 2 together gave way. Cheap materials used maybe. But like you say, won't know what's the cause until the investigation is done.. if it gets released.