15 years to execute a bait, ... it make things worse.
Bait and switch is when a
writer encourages the
reader to invest attention in a developing emotional or suspenseful situation ('bait'), only to substitute ('switch') a high-action
payoff which has nothing to do with the previous development.
Copy pasting is not an issue if it serves the purpose.
Read that again ⏫
Gum Gum No Mi was a 'bait', and Nika Nika No Mi was the 'switch'.
Foreshadowings are meaningless in this case because if Oda was relying on foreshadowings he would not have given wrong name to his Devil Fruit.
He is continuing the bait by being vague about the DF's abilities. He simply said it is up to the user's imagination.
Is it a reality warping DF?
We dont know. Luffy needs another power up to win against Imu. So, you can expect one more moment like Nika reveal.