The blades should be designed to take anything that aircraft weight can throw at them to be able to cope with aerodynamic loads.
Would it be fair to say that if an engine was to cause delamination due to too much torque it would be a very impressive machine performance wise? They are pretty good but not that good.
With the R22 teetering and flappimg head this would be reduced even more so.
You could suspect spindell damage as operational but not delam. It is a very sterile procedure and it wouldn't take a lot to have in inferior batch
Now, flapping in the breeze while shutdown could be a contributor. The stress in that particular area may be more so without any centrifugal force. Much more likely than overpitching I would think.