Hubs are not required to be filled, just adequate grease in the bearings and it will slowly move to the outer bearing. The bearings are greased at the factory, or you wouldn't make it 50 miles, they just aren't 100% full.
My Al-Ko owners manual states that the wheels do not need to rotate to be filled via the ultra-lube.
A couple pumps every few thousand miles is plenty, the drilled passage points towards the outer bearing and is under the inner bearing.
The ez/ultraa lube is not a fix for good ol fashioned hand packing every few years. I plan to do mine this year, with about 8K on the OEM bearings. I also plan to put better bearings in, the ones I have looked pretty loose/cheap when I inspected one of the wheels last month.