Those pointing out that ballistic ICBMs are hypersonic are correct. And yes we have the technology to take out with likely greater than 50% accuracy ballistic hypersonic ICBMs.

The significant difference here is this. Ballistic trajectory ICBMs generally follow a parabolic arc. This method of delivery requires that the missile is slower on the boost phase (going up to highest point in arc) and also is slower when it reaches the top of the arc. The hypersonic speed really comes when the ICBM reaches it's terminal reentry phase. Consequently our intercept technology is designed to hit the missile before that terminal hypersonic reentry. Additionally, the ICBMs path is generally known based on the understanding it will be on an arc.

This missile bring tested by China doesn't take a standard ballistic arc. Instead it goes up to low earth orbit and can maneuver and stay on that low earth orbit trajectory for a full rotation of our globe (possibly multiple rotations). The hypersonic travel continues from shortly after launch through to the orbit and maneuver stage and finally to the reenter and dive to target stage. This should result in the missile as a target moving at hypersonic speeds with substantially greater maneuvering at altitude than a ICBM can accomplish. And that aspect is basically outside the deign scope of our publicly tested anti ballistic missile system.

The fact this missiles initial trajectory can be vastly altered in flight and it's slow boosting phase no longer will be presented to our targeting systems, it presents a whole new problem for our defensive anti ballistic missile systems.

These missiles can be launched on a polar orbit trajectory to the south pole. At the slowest phase of travel, this missile would be away from our standard defense system deployments (by traveling over the Indian ocean. They can maneuver to cross the south pole and directed to over fly South America. Then they can come up and pick the target from our southern border to anywhere on the North American continent. It's not a new concept. Iran has also planned to use a southern polar trajectory to send missiles to the US. Only difference is Iran hasn't quite gotten the pieces all working for that yet.

Unless we already have a new system to the one that has been tested in the past 20 years publicly, and that new system is operationally ready to deploy already, then I believe this hypersonic missile had just obsoleted our current ICBM missile defense technology.