Rumour is that this test is quite revolutionary because the target vehicle was a manoeuvrable warhead undergoing active avoidance manoeuvre and it was still successfully hit by the KKV. The KKV booster's zigzag exhaust trail visible in some of the videos is apparently evidence of this.
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If those rumours are true, would this be the very first successful interception of a MaRV in history? At least in publicised/declassified events.
I don't recall SM-3 or THAAD or even PAC3 conduct tests against MaRVs out of the publicly disclosed interception tests that have been done with those platforms. Cold War era Nike programs performed interception against ballistic targets and the way some of those publications are written, they sound like extremely favorable control environments for the vintage and modern tests.
Zig Zagging motion almost definitely means target was maneuvering for the interceptor to have to update interception points so dramatically and pull those turns. Some political statements are being sent. Maybe the CCP is concerned about Biden pursuing some militaristic adventurism in Asia like Obama wanted to build the foundations for.