Agree, the lack of surface details points to a mock-up. While that's perhaps a bit disappointing considering the WZ-8s are apparently real and how long Sharp Sword has been in the works, it's not unusual in a parade and does re-affirm for even the most jaded sceptics that the nozzle will eventually be LO. The nose wheels were tiny on the real prototype as well - have to be to fit inside the shallow nose!
That's big leap in thermal protection requirements (higher temperature due to higher speed *and* longer exposure due to longer flight time), ask the Russians with Avangard.
Avangard is meant to be HGV ie unpropelled as well? China probably has HGV warheads in service on long range ICBMs perhaps even JL-3. Since we have never even seen a mockup of Avangard, why do we assume it is ready and assume China needs help getting HGVs on other delivery systems? By the evidence available, it would appear that China is well ahead of Russia in terms of hypersonics. Look at what we know within reason:
China has more and better hypersonic wind tunnels and supercomputers.
China has been claimed by the US to have conducted several successful hypersonic maneuvering tests for longer than Russia has.
China has shown what appears to be an actual HGV on DF-17.
One Chinese university has successfully conducted a hypersonic research test exploring double waveriding.
The other claims are rich on all sides and equally dubious. I mean we've heard leaks about claims of new scramjets and new breakthroughs from China on hypersonic works for ages and almost on a biannual basis. Russia had a few animations. Of course I've no doubt Russian hypersonic projects exist. There have been plenty of "UFO" spiral observations in Russia and China regions for a long time now... even one off California a few years ago, no doubt Chinese, US, or Russian in origin.