The news article provides little meaningful information, and what it does provide is conflicted. A propeller coming off the engine is not at all the same as a prop shedding it's blades. In that case, parts of the propeller have come off the the propeller assembly...but the article doesn't really state what happened, and the photograph isn't much use either.
Many things could cause a propeller failure, and with so little information provided, anything further to address the matter would be pure speculation (an unprofessional and pointless endeavor).