That sounds hard to believe to me, small drones have to be close before you can see them, I would have thought the chances of spotting one from the cockpit of a passenger jet on final at 700 feet at approach speed would be extremely remote.
I am no expert on this but I thought most piston engine twins were not good on one engine and struggle just to maintain height, I can think of two crashes where everyone died where the pilot tried to make it home on one engine.
It has been suggested some pilots not coping with engine failures could be a reason for the draft proposal for Jabiru aircraft. Please don't say the fatalities have not been in Jabiru aircraft as it really is not the point.
If you think that then don't blame CASA or anybody for not wanting Jab pilots taking unsuspecting passengers, flying over built up areas or students going solo in them.