But... why are they calling these "Doppler" shifts? A Doppler shift is a frequency change due to motion of the transmitter relative to the wave medium. Clearly they're not throwing these radios around. So these are just "frequency" shifts, right?
So they're just calling these "Doppler" shifts because they are so small that they don't really have any effect on the WiFi link, just like real Doppler shifts should be compensated for, while the tiny frequency shifts still contain enough information to be picked up by the BLE radio.