Nothing is ever black and white.
As far as I can ascertain, Flight (Airplane) Mode switches off transmitting functions. In some devices "Receive-only technologies like FM radio and GPS still operate if the device is so equipped." Wiki...
But, when in Flight Mode, WiFi and Bluetooth can be reselected to ON if allowed and desired.
I suspect aircraft manufacturers have been hardening aircraft systems to better withstand EMC emissions from pax equipment.