Bit of a strange story. There are two elements here.
If the Capt requested 110T. and the totaliser reads 109.5, then I would add more fuel to get the totaliser correct.
The B777 totaliser is just a sum of the three tanks.
Trying to convince the Capt that it is reading wrong means identifying which tank is at fault, doing a stick check, and raising an MEL item. Much too much work! On our airline the allowed uplift discrepancy is 2000kg for a B777.
I refuel B777 every day, but not 110 tons, ours only fly for 11 hours and 85 tons is enough. It is very rare to get a gauging problem, but at the end the difference between calculated uplift and actual uplift is in the region of 300 kgs. When you are uplifting 100000 litres a small error in the SG can make a difference.