The threadstarter's interpretation of what the ATSB notification actually says is quite inaccurate. It was NOT a double engine rollback, initially the right engine rolled back and was automatically restarted by the auto ignition system. At that point both engines were in operation. Later the left engine rolled back and again the auto ignition system worked as advertised and restarted the left engine. At no time was there a "double engine roll back", there were 2 seperate roll back instances. At least one engine was operating at all times.
Read the ATSB's actual words at
https://www.atsb.gov.au/publications...r/ao-2018-081/
CC