A washing machine doesn’t have the torque to seriously injured you. I have been reqatching old Mythbusters episodes and there is one involving a man getting spun while standing in a washing machine. They found that amy substantial weight stops a washing machine from turning and that it is easy to stop with your hand. The motor isn’t designed for that.
For what its worth, that paper is referring to injuries to children using a style of machine that hasn’t been sold in the US since 1983. But point taken.