Can you have landing flap without gear, without a bloody great horn going off?
As has been said, not a chance. With flaps in the landing range and the gear not down and locked you'll generate a full landing config warning.
My
guess is the flaps were in a different position (and the gear not down), so the config warning only happened at 800 ft - but that is just a guess
Time will tell. I've always thought Ben's writings exposed himself to abuse from knowledgeable people.