RPM repository at packagecloud.io empty?

TimescaleDB and PostgreSQL Installation, Configuration, and Errors
1

https://packagecloud.io/timescale/timescaledb/el/9/x86_64/ is empty.

Is it the correct URL for RPM’s for RHEL9?
If it is not correct: what is the correct URL?
If it is correct: any ideas when the repo will be back online?