Must be a typo. Otherwise the camera would be useless during winters in Northern EU areas, like Baltics and Scandinavia, and many other places in the world. My 1st DSLR Canon 40D worked fine even at -40C. Can't comment on 5DIV as unfortunately we haven't have any proper winter past few years.
That's typical range for battery devices so you can't blame them if the battery life is awful at -20C.
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