With all the crazy shit going on in the world and has been, I wouldn't be surprised if it's legit.
The dude had 10 kids and the whole story of his disappearance is spoopy af..lots of holes and a weak "from memory confirmation" of his corpse decades later. The C_A and German gov't were heavily vested in finding his remains if that says anything.
http://spitfirelist.com/news/martin-bormanns-relative-cheryl-bormann-defending-a-guantanamo-terror-suspect/
https://en.wikipedia.org/wiki/Martin_Bormann