I never admitted I was wrong. What do you mean? What I said is that swapping the x-axis and the y-axis will still move along the x-axis. It will never flip 90 degrees about the y-axis and remain 1D. In 4D Golf, despite the y and w axes switching, everything is still visible through the x, y, and z axes because it is actually a 3D game—same thing with the 1st dimension. Even if the x and y axes are switched, everything is still visible through the x-axis because it's still a 1D game.
The only reason I used AI is that you can't understand the basics of the 1st dimension. Also, AI doesn't just give random answers. It uses information from the internet to determine the answer.
I don't really see how it doesn't make sense. If the gravity is flipped in 2D, then either up and down are flipped or left and right are flipped. Same with 1D. Left and right will be flipped. A good example of 3D is the entirety of Crazy Gadget Zone in Sonic Adventure 2. For 2D, a good example is Sonic 3 Flying Battery, where you can walk on ceilings with the lightning shield. There is a great 1D example of a gravity flip on "1D Platformer" by Piyabnye000.