It probably wasn't the only thing affected. It's just flipping bits in encryption keys has much more dramatic and obvious effect than flipping other random bits

It probably wasn't the only thing affected. It's just flipping bits in encryption keys has much more dramatic and obvious effect than flipping other random bits in memory. Flip a bit in a raster image and you get one funny-looking pixel. Flip a bit in an AES key and you completely corrupt all the data handled by that key.