I don't think you can directly do anything to change it, but GD valuations do change from time to time. When they added a ton of new sales data a bit ago some changed, many up, some down dramatically.
In terms if a buyer bringing up a GD valuation in discussion, I think it is important to show the imprecision of the instruments with some sales prices vs valuations to illustrate that. Also, some have pointed out that GD own NameFind portfolio are in many cases priced very differently than their own appraisal.
Even if you never plan to use them for any other purpose, if you know all of the robotic valuation estimates for a name you are in a good position to respond in the rare case when the potential buyer brings that up. Generally speaking Graen and Dynadot tend to often be higher than GD Valuator. One can also know values from the Saw, Estibot and NameWorth valuators. Once a buyer mentioned GD and I quickly shared the other, higher, valuations, and the name did sell, even though I hate negotiation and I am the world's worst negotiator.
Bob