At some point, this isn't sufficient, and pilots need to start the auxiliary power unit (APU) and go through the full restart procedure as though on the ground.
But this is a moot point, given there was no fuel left...
Makes one wonder. Fuel is measurable, not only via fuel sensors, but as inertia expected vs inertia actual by laser gyro (https://en.wikipedia.org/wiki/Ring_laser_gyroscope).
There must have been some pretty deviant values on that screen. Unless the system just "calibrated" those deviances away..