Scherf
The He 219 had an auspicious combat debut. On the night of 11-12 June 1943, Werner Streib flew the V9 and shot down five bombers, before crashing on landing.[2] In the next ten days the three Heinkels He 219A-0 pre-production aircraft would shoot down a total of 20 RAF aircraft, including six of the previously "untouchable" de Havilland Mosquito fighter/bombers. Greatly encouraged, Kammhuber continued to press for immediate production
From September 1944 through to May 1945 a total of 92 night-flying Mosquitoes of all marks flying bombing, target marking, intruder and nightfighter operations were lost
now maybe wiki is not the best form of resource material, (alot of inaccuracies) but for a quick check on the issue they do show that the claim of the 6 kills was recorded and that enough night fighters were lost during the war that this claim could hold some validity.
so instead of offering an empty and baseless argument why dont you show where your information that this is an inaccuracy comes from.
as has been proven over many issues, the allies were far more likely to falsify and/or exaggerate reports than the germans were, (the battle of kursk, number of air to air kills as opposed to those actually killed on the ground ect) i believe it is upon you as the disputer of the claim to offer some proof aside from your "cause i said so" to support your claim.