The CGI scenes and the live action scenes which transition to or from CGI scenes are taken from a low resolution source, possibly LD, and cropped to 16:9. The same goes to many of the scenes with the text describing the cast and crew. However the “pure” live action scenes look like “new” film scans.
BTW I shared my copy of The Gathering years ago on myspleen, it’s 4:3 and the original version, and I bought it when it was new.