Don't mind us, just testing our hypersonic missiles by flying it across Taiwan:
Even before the main stage of the exercise kicked off on Thursday, Global Times called them “unprecedented,” adding that Chinese missiles were expected to “fly over the island of Taiwan for the first time.” People's Liberation Army (PLA) forces are also expected to enter the area within 12 nautical miles of the island, and could potentially surround the island “entirely,” it added, citing military “experts.”
The video - I didn't manage to find a credible source showing it with a similar description. And most other sources I've found had people heavily suggesting it's either fake or unconfirmed. It also looks slow to me. And this suggests the same - it's about the first video I mentioned above, in which the speed seems roughly similar to the last one you're talking about:
The speed of a hypersonic missile in terminal phase (right before it hits target) is very high, greater than a mile a second,” Kelly Stephani, a mechanical science and engineering professor at the University of Illinois Urbana-Champaign wrote in an email to The Associated Press. "If I had to estimate, this video shows a projectile traveling ~1000-2000 ft to target, and took 2 seconds to impact. If it were a hypersonic missile, it would have traveled that distance in a fraction of a second."
But then again, it's talking about the terminal phase of flight.
This, however, seems real but much less fascinating than seeing the thing crossing the sky.