FUCK so I went back to read the original instructions and I was was actually wrong because I didn't read it carefully.
It says to find the point with minimum average distance, not a centre of mass as I thought.
I fucked up, I admit it.
>>12729604If you compute the average position of the dots, you will find that the extra bottom square has a negligible effect, and that the point chosen is still "correct" if that's what one was looking for, but it isn't.