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I got an answer regarding the back-EMF number in the datasheet. The back-EMF voltage waveform is a sine and the listed value is the peak value. What this means in practice is that energy can still be pushed into the winding before and after the peak, once the back-EMF is below the driving voltage. The graphs are derived empirically.

To be clear, I have not received the motor and verified this, but it seems to make sense.