Agree with AC and DT - just a poor piece of piloting and decision making. Who could have envisaged performance problems on a mountain site at just below MAUM? And in an aircraft known to have TR performance issues! I can't believe he didn't throw the approach away far sooner but at least he is still around to tell the tale - more by luck then judgement!
Back to the 429 accident - looks like a TR control issue - stuck pedal type scenario - since the yaw is affected markedly by airspeed. Could be a physical restriction in the yaw controls or a thrust bearing or a TRGB mounting problem.