if I understand right from the short look to the datasheet, the STAT pin is an open drain, so if you connect it to the FET on the wall adapter side, you have to bias the gate with a resistor to source.
the drawn 470k R belongs there, and not connected to the load side of the FET controlling the battery side
when running on that supply, STAT should go low and drive the FET fully open, so you should measure a few 10mV between GND and gate.