Personally, I'd contribute to a research fund just to put an end to this discussion. If the man is who he claims, the facts should come out and his place in history confirmed. If the story is a fabrication, that should come out and put this to rest, once and for all.
Not sure of the accuracy of the info, but here's the basics that were requested:
"
Gottfried P. Dulias was born on June 25, 1925 in Koenigsberg, the capital of former East Prussia, Germany. He was the third child of Paul and Lucie Dulias. The family’s ultimate settling in June of 1939 to Fuerstenfeldbruck (near Munich) in Bavaria followed a move in 1934 to Osterode."
source: http://www.luftwaffereenactors.org/Dulias.htm
or, via a photo of his display at Geneseo, NY: Name: Lt. Gottfried Paul Johannes Dulias