BUG #17987: zypper refresh failed when installed the postgresql

The following bug has been logged on the website:

Bug reference: 17987
Logged by: zeng
Email address: 270246512(at)qq(dot)com
PostgreSQL version: 13.11
Operating system: suse
Description:

when try to follow up on the guide https://zypp.postgresql.org/howtozypp/,
meet the following error on the zypper refresh.

bash-4.4# zypper addrepo
https://download.postgresql.org/pub/repos/zypp/repo/pgdg-sles-15-pg15.repo
aa
Adding repository 'aa'
.................................................................................................................................................................................[done]
Repository 'aa' successfully added

URI :
https://download.postgresql.org/pub/repos/zypp/repo/pgdg-sles-15-pg15.repo
Enabled : Yes
GPG Check : Yes
Autorefresh : No
Priority : 99 (default priority)

Repository priorities in effect:

(See 'zypper lr -P' for details)
1 (raised priority) : 3 repositories
99 (default priority) : 2 repositories
bash-4.4#
bash-4.4# zypper repos
Repository priorities in effect:

(See 'zypper lr -P' for details)
1 (raised priority) : 3 repositories
99 (default priority) : 2 repositories

# | Alias | Name | Enabled | GPG Check | Refresh
--+------------------+------------------+---------+-----------+--------
1 | CBA_REPO_NEW | CBA_REPO_NEW | Yes | ( p) Yes | Yes
2 | LDC-CBA-SLES | LDC-CBA-SLES | Yes | (rp) Yes | Yes
3 | LDC-CBA-SLES_DEV | LDC-CBA-SLES_DEV | Yes | (rp) Yes | Yes
4 | aa | aa | Yes | ( p) Yes | No
bash-4.4#
bash-4.4#
bash-4.4# zypper refresh aa
Retrieving repository 'aa' metadata
...................................................................................................................................................................[error]
Repository 'aa' is invalid.
[aa|https://download.postgresql.org/pub/repos/zypp/repo/pgdg-sles-15-pg15.repo]
Valid metadata not found at specified URL
History:
-
[aa|https://download.postgresql.org/pub/repos/zypp/repo/pgdg-sles-15-pg15.repo]
Repository type can't be determined.

Please check if the URIs defined for this repository are pointing to a valid
repository.
Skipping repository 'aa' because of the above error.
Could not refresh the repositories because of errors.

#############
uname -a
Linux pg-0 5.3.18-57-default #1 SMP Wed Apr 28 10:54:41 UTC 2021 (ba3c2e9)
x86_64 x86_64 x86_64 GNU/Linux