Just watched it for the umpteenth time since last week.
Said earlier, the sequence to stall is like something's holding it back.
I believe that an experienced crew, such as they were, would have corrected a trim issue in time. They made 1200ft, but was it a recoverable trim issue or CofG ?
I only ask, since once established in the climb, it is easy to observe an anomaly, which may be corrected in good time IF one understands the cause.
Load shift (beyond CofG) is not really an option for recovery so near to the ground.