And they had to make multiple visits and also visit a pre-defined NGO. In the examples I saw (not necessarily shown in the movie) the times and frequencies of the visits were very strong evidence.
What is the probability that somebody is driving around a city at 3AM and they "visit" five drop boxes?
Just because the location data is not exact to the foot it does not invalidate the analysis. In many cases there is nothing else around that would attract someone to stop and "visit" in the middle of the night.
D'Souza pretended in 2000 Mules that the geospatial data was accurate to within a foot or two, without giving a specific number. If the data was only accurate to within a radius of 100 feet, that does not confirm a visit to a ballot box or anything else. No one is ever going to be convicted of voter fraud in court if the evidence shows only that while driving around he came within 100 feet of five ballot boxes.
It is garbage data -- worthless.
When True the Vote purchased the data, the businesses that sold the data certainly specified its accuracy.
D'Souza intentionally omitted the specific accuracy from the film. You can decide for yourself why he did.