What is the significance of a man sitting on the train engine in the last scene of "Live and Let Die"?

In "Live and Let Die", after Bond throws Tee Hee Johnson from the train window at the very end of the movie, and returns to Solitair, we see an image of smiling Baron Samedi sitting on the train engine:

... despite the fact that in an earlier scene, Bond killed Samedi by kicking him into a coffin full of snakes.

Wikipedia has this to say on the topic:

Later on, Bond witnesses Baron Samedi rising from a grave, and shoots him in the forehead; however, it is revealed to be nothing more than an animatronic dummy. Only minutes later, however, the real Samedi rises from the grave and engages Bond in a machete fight. Bond kills him again by pushing him into a coffin full of snakes. But just before the end credits roll, Samedi is seen riding on the front of Bond and Solitaire's speeding train (laughing), suggesting that he either survived falling into the coffin of snakes or that he was not mortal to begin with - that he really is "the man who cannot die". Because of this, he is probably the only James Bond 007 character to take on a supernatural basis rather than reality itself.

Question:

Was there ever any clarification on the point of this shot from someone involved with the movie (as opposed to pure guessing in Wikipedia)? Was Samedi merely not killed by snakes, or were the creators intentionally showing him to be immortal/supernatural?