I remember those Starlog articles from when they were first published. They completely misunderstand how time travel works in the movies.
There is no Earth 2 or 3, etc. History is rewritten. That is the theme of the whole Trilogy. There is not another Marty McFly at the beginning of the movie at the Twin Pines. Its not the theory of traveling to a parallel universe. Or how would pictures from the future change? How would the Twin Pines Mall become the Lone Pines Mall?