Quantum supremacy?

Last month the Financial Times reported on a scientific paper, briefly published on a NASA website before being deleted, claiming that Google has built a quantum computer that achieved quantum supremacy. A plain text version has been anonymously posted on-line. It says that Google created a quantum computer with 54 quantum bits and used it to perform a very specific set of operations in 200 seconds that would take a supercomputer about 10,000 years to complete. One summary is: rudimentary quantum computer is better being at being a rudimentary quantum computer than a supercomputer