None of this is relevant to the question being investigated, which is a simple and verifiable one.
1. Take any two points on the same Southern latitude, one degree of longitude apart.
2. Find the distance between them.
3. If the distance is less than 111km (which is the distance of 1 degree at the equator) then the earth is not flat.
This is as close as we can get to Rowbotham's test, not mine.
Applying the test for two chosen points in the Falklands, we find the distance between them is much less than at the equator.
If Tom has an objection, then either (1) the positional coordinates are incorrect. But I have done extensive research on pre-satellite systems of measurement, and they seem to be correct. Or (2) the distance is wrong. But 50-100km is not a long distance, and it could easily be tested by driving.
In any case, please address the OP, and don't go off topic.
Longitude and Latitude isn't used by Google Maps/WebMercator to measure distances.
Are you disputing the distance between
Hill Cove and Port San Carlos?
Very well for the next experiment we must find two similar points connected by road.