What is an asymmetric wheel and why would you use it?
The "asymmetric wheel" terminology is a little misleading. This particular wheel has an asymmetric rim.

Any bike with a rear derailer setup will have an asymmetric rear wheel, because the gears take up space.

The usual way to handle this is that the spokes on the gear side have less of an angle (closer to vertical) than on the non-gear side. (That is, they have different dish angles) Since an angled spoke also pulls outward slightly and the horizontal forces need to balance, the gear side spokes also have higher tension.

That more vertical angle and higher tension makes the gear side weaker. Combined with pedaling force tending to apply more on the gear side, the most common spoke failure is on the gear side of the rear wheel.

In other words: the gear side of the rear wheel is the limiting factor in the strength/lightness balance when engineering and building a rear wheel.

When a rear rim is asymmetric, what that usually means is that they've moved the line that the spokes all connect into away from the gears. This allows the angle to be slightly further from vertical while forcing the non-gear side a bit closer to vertical. That is, both sides will have closer to the same spoke angle. That means that the tension on both sides can be closer to matching.

Having the dish angle and tension closer to matching allows for the hub and spokes to be stronger and/or lighter. (but may require strengthening the rim slightly)