Forgive my ignorance, but isn't a decision height the height at which the decision to continue the approach or conduct a missed approach must be made? Not a do not fly below height?
Had the captain made the decision at the decision height with a rate of decent of 600fpm (for an example, I don't fly the big steel) then he would have been below that height by the time he has commenced the missed approach, but also legal.
I'm assuming it was an ILS given the minima, as long as he is within tolerances and decides to conduct a missed approach at the decision height, then the wheels can touch down as he is powering up, and STILL be legal!
Or I may be completely wrong.