I had a friend who owned a home on a backwater of the Tennessee river at Scottboro Alabama - it was a short stretch of water with trees
on both sides....He preferred to land there than on the main river because of the amount of water craft traffic -- it seems when he tried to land every motor boat on the river headed straight at him.....his secret was the same as this guy --- slip it in right above the stall then hold the stick back to get aerodynamic/hyrdodynamic braking.
Erm...well....just because so far he has not had an accident does not make it safe. The Cub is a lovely aeroplane, but it has a very low wing loading , and those trees are ace for generating unpredictable turbulence .....