It is balderdash. The top 34 German aces are each credited with shooting down at least 150 allied aircraft. Their claims totalled 6,902 victories.
Many of these victory claims cannot be confirmed actual allied loss records. The Luftwaffe pilots always cover their backsides on this account by stating that many of these victories came against the Russians, whose pilots are portrayed as incompetent boobs.
Fits in rather nicely with the racist Nazi "untermensch" philosophy doesn't it.
Top allied aces, especially the British, who faced the best the Germans had for six years, are very skeptical of these claims. To quote one of them, "The German fighter pilot seemed no better than ours in 1940, and a lot less good by 1944."
These claims served to bolster the spirits of the German people in an increasingly grim situation, and encouraged eager young men to continue to enlist in the Luftwaffe.
If it is any comfort, the Japanese, perpetuating their own racist dogma, also registered vastly inflated victory claims during the war.