This claim is false because Nintendo has been trying endlessly to say that the game is such, but have failed at every attempt. Pal World falls under fair use, which protects it from Nintendo's lawsuits, and because all attempts of suing have failed, it safe to say that Pal World is not a product of plagiarism. As for the AI claims, the article linked above uses a single Twitter post as evidence, which is no where near a trustworthy source, making this claim also not true.