I don't think this is a Kirby plot. Or at least, not one he gave much thought to. Let's look again at the checklist:
Eight ways to identify a Kirby plot
- More than a twist: The plot does not ONLY rely on a twist at the end. It is satisfying even without the last panel.
- Kirby did the layouts.
- Description above the title. Kirby's stories were richer so needed the extra introduction: see Challengers, New Gods, Eternals, etc.
- Every page is rewarding. There's something new and interesting on every page: it doesn't merely tease the ending.
- Reality: The story is based on science, or history, or something else from the real world.
- How would I defeat...? The story has you thinking how to beat a new threat. And the solution is something that would work in the real world. Kirby said in interviews that he got a kick out of thinking up some wild new threat and then thinking "how would I beat it?"
- The dialog fits the art. The amount of dialog does not look squashed in awkwardly: it is roughly what the artist (Kirby) intended.
- Originality. The story is either original, or has not been used for a couple of years and adds something interesting. But if it's just the fifth "alien invasion with a twist" this year, then it was probably suggested by someone else.
Kirby did the layouts, and the dialog fits the art, but that's about it. The rest of it is just a single idea, yet another "alien invades, and we trick them" story. The science does not make sense: the creatures are too big to survive deep under water (not enough food or air) or to stand up above it. The story has numerous problems: are the Atlanteans really that stupid? Could such a fake monster be built in a reasonable time? As for internal consistency or unity, look at the final frame: humans saying "we are so clever" but leaving evidence of their fraud for any ocean creature to see!
On to the next story.