Was that part of the marketing at the time, or just some bizarre leap from the author? I’m having a hard time finding any good comparisons between La Forge and Spock. In season 1 Geordi wasn’t even in engineering, let alone the science officer. He was a helmsman, so in that sense more comparable to Sulu or Chekhov, and he certainly doesn’t have anything like the relationship with the captain that Spock did.
Is it just because he was a recognizable name at the time? It’s just a weird jump to make.