This propaganda is incorrect:
"1986-1992 Version:
This was the golden era for standard definition releases of the Star Wars films on home video. The analog tape master that was created for this release of Star Wars was never tampered with with any attempt to clean the image, or filter any detail. No new material was added, and there are no digital effects to be seen. An interpositive was scanned, and that’s essentially it. These widescreen masters were created in 1986, and served as the home video masters that were used up until 1993 for Laserdisc releases of the trilogy. They exhibit occasional print wear, with dirt and scratches showing up on screen. This was also the first time that the film was remixed for Dolby Surround, the home video equivalent of Dolby Stereo. Previous releases of the film were in mono sound only, assumed to be created from a stereo sound master used to make 35mm prints of the movies."