SRAM SX Eagle
 

If X01 was the new X0, and so on, then I guess this is X5.

https://www.bikeradar.com/news/sram-sx-eagle-groupset/

Reportedly nearly half a pound heavier than NX, making me scratch my head and ask where did they find to put another half a pound?

Maybe they took one of the X01 cassettes out of the machine after it routed out the teeth but before it removed the inner parts.

its probably an attempt to lower the pricing which is actually good they are going to try that. you have other companies like microshift coming out with cheaper 1x11 mech they have to keep up.