As I understand the report, the pilot got into a state of having both engines shut down due to a faulty thrust control (broken rivet).
The report highlights a relight procedure problem which can catch the unwary, it is only possible to relight one engine at a time and if the first relight has not fully completed any attempt to start relighting the second will cause BOTH to abort.
This seems rather
daft to me, surely it would be more sensible to simply inhibit or delay the second relight until the first has completed ?.