If you notice, the article says Streisand and Alan Horn's foundations paid for the showings. So it wasn't a doc that was released to the theaters, it was just shown in select areas of FL (probably black and non-Cuban hispanic) to make the voters who might stay home, so mad they do everything they can to get to the polls and vote Democrat.
The thing 'rats fear most is that their well-programmed voter base stays home. This "film" is the bloody shirt.