In the F Series the hubs are sealed but only on the outsides! Except there is a gap between the two bearings where the "tone" ring is located. Grease pumped into the hubs thru the ABS Sensor hole will reach the bearings.
I am guessing Greasing Hubs thru ABS Sensor hole isn't possible. The Hubs on my Fusion do not not have a Sensor hole as the "Tone Ring" and ABS Sensor are external to the Wheel Hub.