I'm honestly not convinced by the idea that this ship will be completely taken out by a single hypersonic missile, unless its a ballistic or aeroballistic one. Their warheads are pretty small, they tend to slow down on their final trajectories, and their kinetic damage can be mitigated through several structural elements like bulkheads. Many here are assuming that these things will be sailed in range of hypersonic missiles from the mainland. Who said that ? To me, it makes obvious sense to expand attrittable assets in the first few exchanges before deplying the "big guns". The biggest threat to this ship will be in the middle of the ocean from another vessel or a small island base, where it will be able to fire back and intercept incoming missiles. It is also unknown whether these ships are even intended to face off against mainland China in the first place. They could be used to hammer smaller nations in the americas, Europe and the middle east whilst tanking things like drones (air and sea) and slower cruise missiles.
Also this not completely related, but with regards to the postponement of the FA/XX, could it be that the US realized that with how expensive their sixth gens are becoming, spamming missiles might be cheaper ? That could explain why they're switching to building 25 behemths and designating them as capital ships. I don't know, I'd like to know what the more knowledgeable members here think of this.