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Still, I'd say it's a pretty meaningful figure.
I'm not quite sure on the point of that article being brought up. I have no idea how a 50G car crash compares to a 50G rugby tackle in terms of risk of injury. On a tangential note though, it'd be interesting to see how the acceleration differs between their head (where the measurements were taken in the above article) and the body. I imagine the head gets the more extreme measurements (obviously I can see the reasoning for focussing acceleration on the head when it comes to sports like rugby & American football).
I wouldn't call peak decelleration of that magnitude a meaningless figure.