A while ago a cockpitfull of various flight deck crew managed to remove parts of a building down in Johannesburgh while taxiing.
Afaik all of them had four working limbs.
I also know of a French crew who managed to stall a perfectly fine aircraft right into the middle of the Atlantic. All four limbs working flawlessly until impact.
Sometimes your limbs have nothing to do with the worst of outcomes at all. See those poor Malaysians for reference.
This guy managed to save a landing that could have had a really bad outcome. And he did it with only one arm. That is the way I see it.
I really do hope someone makes a better fastening device for that arm though.
Oh, and regarding certified aircraft parts detatching from the airplane... I just happen to remember that part of a DC-10 cowling was found on the runway after the fatal 2000 Concorde crash. Certified cargo doors and even engines falling off mid flight...
Nah, give the guy a break.