I mean, the idea is predicated on you standing precisely on the North Pole.

In such a scenario, all directions are, by definition, away from the North Pole, ergo they're all South.

The North Pole is a single point, like a mathematical point with no area. When you are on that point then everything is south. When you are even one millimeter off the point then what you’re thinking becomes correct.

THink of a ball. There's one point on the ball that's the top of the ball. It's a very precise point, but it's there. Any direction you go from that point isn't going around the ball - it's just down.

Once you're off that point, you can go around the ball. But on that one point, all you can go is down.

Earth is the same.

Think of it like standing on top of a hill. If you go straight to your destination, it'll be straight down hill in some direction. If you start out a little left or right (west/east) you'll have to make a curve (longer path) to get there.

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If you’re at the top of a pyramid you can go left right forward or backwards but no matter what you’re also going down. Same logic

imagine you're in Kansas City, then you travel 100 miles due south. If you drew a line between the two points, then extended that line all the way around the world, like a spun-around equator, it would pass through the north pole right? That's how you know it's "due" north or south, because it passes through the poles, any other direction wouldn't.

Well, if you draw an equatorial line between the north pole and any other point, it passes through the north pole, by definition.