It was only four days after Xia Hanchen's demise that news of it was published. It was all Flynn's idea; since the former was a renowned businessman, it would be questionable if he simply disappeared without a trace, with no explanation whatsoever.
It was also his idea to state that he was involved in a fatal car accident and that he had died in the hospital while undergoing a surgery to remove a clot that was near his brain. Obviously, no one would go around asking every surgeon whether Xia Hanchen underwent the surgery in their hospital and even if they did, he had already arranged for a false schedule in a hospital.
When Xingyu read the news which he knew to be fake at a single glance, he was in his room in the Jiang Mansion and Luna was brushing her hair at the vanity. He knew that there wasn't anyone who would not be sad about their parents' death. It must be even sadder for Luna, having to lie to the public when she knew fully well what the truth was.