CCTV capture of complete takeoff: https://x.com/ShivAroor/status/1933165937399648447
Apparently the pilot radioed "Mayday…no thrust, losing power, unable to lift!” 11 secs after takeoff.
It would seem to fit with a bird strike on both engines. Or contaminated fuel I guess. The stuff about flaps seems irrelevant.
Quite likely this and Jeju Air crash in Korea and Sully landing in the Hudson were all caused by bird strike taking out both engines.