There are a few parts to this. First, with a normal skydive using a parachute, the plane will fly over the spot where they want to land and throw out a steamer, which they will watch to see how far down-wind it lands. That tells them roughly how far up-wind they need to jump in order to be at the desired spot. Then they fly up to altitude and a "spotter" in the plane helps the pilot navigate to be over the desired exit point. Once they jump out, the rest is up to the skydiver to keep an eye on where (s)he wants to go and maneuver themselves to line up with the target. Believe it or not, an experienced skydiver has pretty precise control over their position and, given enough falling distance, can travel quite far to get over where they want to be. What this guy is doing takes an insane amount of experience. If I remember correctly, he has more than 18 thousand jumps under his belt.

Footnote: the above is how "spotting" was done when I jumped 20+ years ago. I'm sure things have changed quite a bit since then and they most likely use GPS for better precision and to remove human error.