This story is totally believable. When Vince first started out his father was horrified that VInce wanted to be a wrestler and not take over as a promoter. Vince has been juiced for many years. He's a major fan of bodybuilding and tried to market the WBF, and knock papa Joe on his ass. He's a bodybuilding nut. He even wrestled in his 50's, oiled up. The story sounds par for the course. It's not like it involves any sexual acts.
As for Achim, he was a horrible wrestler. They tried to market him as a Hitler soldier type guy named Brakus, but Achim had not ability to wrestle.