I posted something on this earlier but something went wrong. Probably me!
The book proves nothing. It was merely a diary Lloyd's kept. It recorded each wreck as it was reported. There's nothing about cargo, cost or deaths. Oddly enough, the last entry before Titanic is Songvaar, which sank in my home waters. It's said she settled down on her anchor when the tide dropped and flooded when it rose. People dive on her.
After the sinking, the insurers took pains to explain that nobody lost a lot of money, because the risk was spread over many companies and individuals. They didn't like it and raised premiums, but they didn't go broke. If a great amount of gold had been lost there would have been some howling. The story is just another beat-up.
When Empress of Ireland sank, tales were told of fabulous treasure on board. In her case, divers could reach the safe and recover it. It was found to contain a few dollars, mostly to pay the crew. There were some red faces.