I researched LiFePO4 low temp operation quite extensively when first considering an ebike, interestingly I came to the conclusion that there's no consensus, there's little to no consistency it what's offered as operable temperature ranges. There is the BMS aspect however, that with some systems the battery itself is still preforming within the needed perimeters and can continue to do so w/o damage but due to an otherwise miniscule change in available output the BMS may shut down completely... mine hasn't but the BMS units are all built a little differently from manufacturer to manufacturer (mine is a Ping BTW).
Despite the fact LiFePO4 is affected in cold weather application like any other battery, in practical application I've found that the conditions in which this would be a concern are so extreme or easily circumvented that it's pretty much irrelevant, it's not like the temperamental SLA that pooches out if it's slightly chilly lol
As an all season daily driver & commuter living in coastal Maine, it's been my dubious joy to ride in some rather extreme conditions - I've taken no precautions or made any modifications regarding trying to keep the battery warm except parking it indoors for overnight storage (basement, about 40°F or less) yet I have never, not once experienced any difficulty whatsoever in LiFePO4 operation, even with prolonged subzero usage.
I'd recommend not making any alterations just yet, rather just ride it and see - with this 'un I'd very much suggest waiting to see if there's a problem before fixing it. I'm not saying they're immune to the cold but that they may well tolerate it the same or better than the rider could, making it effectively irrelevant
