"Searching for Sugar Man" - true story or scam?

It sometimes happens that a character is larger than life. Quite rarely it so happens though that noone knows such a character. The story of "Sugar Man" Rodriguez seems pretty incredible. And so I have to check twice if that really happened. And Wikipedia says it's almost all true what's in this brilliant documentary. Of course, not all. In "Searching for Sugar Man" the Swedish director made it look like noone really remembered Rodriguez for some twenty odd years.