Gif89 could be considered to be like "video" .. .crude, but still possible to show the level of technology back then was heading in the video direction.
While the GIF89 specification does give the ability to make a "video like" GIF file, what is needed is an actual GIF89 file that used digitized images (from a camera) that were looped together to make the video effect.
In addition, need to find proof that this GIF89 image was made available for download prior to 1990... a BBS log or CDROM archive would help to validate the file.
Great digging!
Fight the Patent!