It's a temporary facility, built from prefabricated, modular components brought in on trucks like a mobile home, and fused together from the outside. Is this an impressive feat of construction? Yes. Is it as impressive as they're making it out to be? No.

Now, as for the locks... sigh
I'm sorry to say, when we're discussing quarantine of a potentially lethal and virulent virus, locking the infected inside actually IS standard quarantine procedure. That's not the part that is unsettling. The part that's unsettling is when you combine the two notions above.
Why does China just happen to have prefabricated, modular, containment facilities designed to lock people inside, just lying around waiting to be speed-built?