The reaction to a configuration warning, about the flaps not being set to take-off, is
to continue the take-off.
That reads like a cultural problem leading to an accident: the lack of respect for a safety culture. Want to bet that previous flights had been done in the same way, just that this one was enhanced with an engine failure?
Your take-off performance is predicated on such things as having the airplane configured in a certain way. If you don't have the flaps properly set, you are now a test pilot! Well, you, your crew and your passengers, too... all of you off on a test flight, and may the Lord be with you.
It will be interesting to see what Stella makes of the final report....