Interesting. Do you have a link to the report available?
This is a well known failure mode for parachute applications, although more normally caused by poor maintenance as opposed to high forces on the equipment, but I'm sure you know that given your screen name
One hopes they re-engineered that specific design in light of this particular accident because it is a superior cut-away system compared to other approaches.
Of course nothing is perfect. Are there not examples of every system under the sun failing at one time or another? This is just one event. I'd still take a 3-ring over any other cut-away system, assuming it was properly sized and engineered. Larger rings and even four ring systems are used where forces are (or may be) higher.