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Try restarting your Kindle (cold boot/reset). There doesn't seem to be a partition table. Can you mount /dev/sdg instead?
From the perspective of the Kindle (rather than the USB host), that user store partition is (ought to be) a bit special. While it is a (eMMC) partition, it contains (should contain) a partition table header on its own, as if it were not a partition but rather a disk on its own. Amazon uses this trick to easily export the whole partition via USB and make the USB host PC believe that it is a full disk.
Did you mess with the partitions / flash storage on your Kindle?
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