At the time of the last list, there were two systems in China that had recently broken this barrier, but their owners have chosen not to submit benchmarks to the Top500.
Allegedly broken this barrier. There is a reason that science is conducted in the open, in a reproducible and traceable manner. Those systems might not function properly at scale, or might not have run at an exaflop in double precision compute.
Frontier is certainly the first publicly verified system to achieve Exascale on the internationally accepted standard measurement.
https://www.tomshardware.com/news/chinese-exascale-supercomp...