That’s a Peterson King Katmai-modded Cessna 182 pictured above in the environment the modification was made for. It’s a descendant of the Wren 460, which was an airplane with a stunning 27-knot stall speed. The King Katmai has a stall speed that’s 4 knots faster, but, as a tradeoff, has twice the rate of climb and a few hundred pounds more useful load.
STOL kits for general aviation airplanes have been around for over 60 years because of two favorable circumstances: 1) They work, and 2) Manufacturers could have invested the money to lower the stall speeds of their airplanes, but at some point further improvements become too expensive for the expected demand and they stopped.