Any citation on this? From what I remember they were always flex, even if sometimes you might have to manually adjust something.
Since you quoted wikipedia, there it goes: ethanol fuel in Brazil. To get the info in a glimpse, check for the caption on the first image of the section (the FIAT 147 one), and read on for further info.
But I know where your misconception comes from: only recently pure ethanol has been used. It was used both as solute and as solvent to gasoline. As a solute, up to 25% volume, it was used to reduce gasoline dependency; and as a solvent to gasoline it was used to help deal with cold start problems of the ethanol prior to electronic injection, but cars were classified as ethanol fueled or gasoline fueled, nevertheless.