Hans-Arnold Stahlschmidt (15 September 1920 – missing in action 7 September 1942) was a German fighter pilot during World War II. A flying ace, he was credited with 59 victories against the Western Allies in North Africa. Stahlschmidt was a close friend of the prominent ace Hans-Joachim Marseille.
Hans-Arnold Stahlschmidt did not shoot down a single Spitfire.
We do not know from the context what types of planes Hans-Arnold Stahlschmidt, they could all be Spitfires, some of them Spitfires, or none of them spitfires.  Therefore the statement is neither definitely correct nor definitely incorrect.
( z1 shoot-down :polarity - :ARG0 ( z2 person :name ( z3 name :op "Hans-Arnold" :op "Stahlschmidt" ) ) :ARG1 ( z4 aircraft-type :quant 1 :name ( z5 name :op "Spitfire" ) ) )