The WhitePaper is plagiated, all of it or some parts?
Plagiarism is plagiarism, even though full, at least partial.
Yes, Justin Sun did get caught plagiarizing parts of the Ethereum white paper. They got caught and re-wrote their white paper. That's no excuse for you to think that plagiarism is OK. Its just a sign of laziness and lack of dedication or belief in your own project.
If the project considers itself decent, it should rewrite the whitepaper as quickly as possible and apologize to both the community and those from whom it was copied.