Hi DozyWannabe,
More to the point, it doesn't alter the fact that the bypass mode was not used by the crew.
It was a good job that this alert crew invented their own "bypass mode switch".
Link
see slide 7
"With pitch attitude continuously decreasing, PF reacted by applying permanent (for about 20s) sidestick order in the full backward position.
• Pitch angle continued to decrease and AC to descend"