The RCMP would say
anything, and so proving them wrong is the joy-joy in this story.
This can be documented. There are original manuals out there, somewhere. And the designer, Vasily Alexseyevich Degtyarev, is well documented, having the Order of Lenin and so forth. Vasily Degtyarev was the one to head the first Soviet firearms design bureau. He has created several types of machine guns, submachine guns and anti-tank guns.
Vasily Alekseyevich Degtyarev was born on January 2, 1880, Tula and died on January 16, 1949, Moscow. Was a Russian weapons designer, Major General of the Engineering and Artillery Service, Doctor of Technical Sciences (1940), and Hero of Socialist Labor (1940). He became a CPSU member in 1941.
The Degtyarev RPD project actually began in 1943. The approved working models came early in 1944.