9Gs vs 21Gs - either can be fatal or survived - it depends upon DURATION! If they did encounter 21G, it must have been VERY MOMENTARY and even then I tend to doubt the figure. A 150lb (guessing) astronaut in a form-fitted suit would only need to have a single crease to be badly hurt at a load of 3,000+ pounds! The same thing at 9Gs would be very uncomfortable.
In total Soyuz rockets have been launched 745 times of which 21 have failed. Thirteen of those failures have been since 2010, calling into question the continued reliability of the rocket.
21 out of 745 is 2.82% failure rate, I guess thats not to bad...sort of.
34 launches since 2010-Present with 13 failures, thats 38.23% failure rate, Hmmmm Confucius say He no rickey lecent flailure late, NO RIDE Russian go BOOMYUZ FIRE CRACKER
Almost forgot- Ill go with the 9Gs was encountered during the actual Capsule Reentry.
Fighter Pilots these days can pull 7-9Gs fairy often since They have GSuits.