The article is too vague to ascribe a cause. “Chemical reaction inside the combustion chamber” doesn’t make any sense to me. I don’t know what is meant by that. I have a lot of time with RB-211s. Never heard of that.
The video shows it compressor stalling - flames from the engine, not the wing, as the article describes.
In general, engines fail because either a control system fails (bad sensor, bad data, processor, etc.) or a mechanical part lets go (compressor blade, turbine blade, bearing). Hard to know what happened in this case from the description.
But compressor stalls happen when the airflow in the engine is disrupted - that can be mechanical, or control system.
If you can’t restart it, it’s most likely mechanical. Typically, a control system has redundancies and will work if the engine is shut down and restarted.
If you hear it “popping” - and I didn’t on the video - then it is still compressor stalling.