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If you click the (helpfully underlined) first use of "shadow fleet" in the article it defines it for you. (Or ask Wikipedia; https://en.wikipedia.org/wiki/Shadow_fleet)
Do you believe Ro Marine would have paid out claims related to their "insured" vessels?
The company in this article could have done that, but they forged documents to avoid it. They had no intention of covering accidents - it was just plain fake to get these ships into ports.