The first Star Wars #trrpg repeatedly suggesting Tatooine as a location for adventures isn't surprising. All Star Wars writers always want compulsively to include Tatooine.
But the suggestion of Bespin as the other generic starting world is interesting.
At this early point, there weren't a lot of known planets to pick from. Hoth, Dagobah, and Endor won't do, and Alderaan was never seen (and blown up). Bespin is a place people would know. And I think actually a place with interesting potential.