However, while Trek does try to adhere to much real world science, it certainly does play fast and loose with many things.
As I have already repeatedly acknowledged, the franchise has often failed to live up to its aspirations. That does not mean we should treat its shortcomings as the baseline of what we should expect from it. It does not mean we should lower our standards and stop asking more from it. What made
Star Trek outshine its contemporaries, as I've said, is that its creators
tried harder to get it right, and that
effort does not lose its value because they didn't always succeed.
However, it's still just a work of fiction and the writers will not hesitate to throw science out the window when it suits the story.
There's a fundamental difference between learning the valid science but choosing to disregard it for the sake of drama or budget, as Roddenberry did on TOS, and not even bothering to ask but just making up nonsense, as did too many of his successors (and most other creators of 20th-century SFTV). I respect and understand dramatic license; I don't respect willful ignorance or failure to try.
Meyer needed a quick explanation for how the Reliant crew could beam down to the wrong planet, he wrote something that sounded vaguely plausible, and that was it.
Do we know that it was Meyer specifically who added that idea, rather than the earlier writers like Harve Bennett, Jack Sowards, and Samuel Peeples?
Granted, it isn't quite as bad as the earlier Bennett-Sowards scripts where the
Reliant crew knew that Khan's people had been exiled to Ceti Alpha V but assumed they'd all died. I mean, their goal was to find a planet completely devoid of even microscopic life, so obviously you're not going to pick a planet that used to be inhabited. So it could've been even dumber than it was.
And there's really no good way to make it make sense.
As presented, no, but then, I never liked the overall concept to begin with. I think it was a waste of the potential hinted at by the end (and the title!) of "Space Seed" to just reduce Khan's people to refugees on a dead planet and tell a cliched revenge story. And the whole idea of Genesis was utterly ridiculous fantasy. (My father specifically singled it out at the time as far too fanciful for
Star Trek compared to its usual standards.)
I'll never understand why people think TWOK is "a great film" -- I find it achingly stupid on many levels. The inanity of the planet-confusing business is just a symptom of its larger brainlessness.