Tires
As I recall the main weight improvement was in the tire they were using and eliminating the tube, not the wheel assembly. Think there was maybe 1-2 lbs in the wheel assembly itself, another pound in the tube, the rest in the tire. Keep in mind you have to buy tubeless tires, of which there are fewer options on the market I believe.
You can get several pounds of weight savings yourself using a lighter tire brand/model. You can also buy tubeless wheel assemblies yourself from the usual US suppliers at lower cost I think.
My 2 cents.
Dwight