Comment # 4 on bug 1182831 from Stephan Hemeier

(In reply to Stefan Dirsch from comment #1)
> Hmm. Indeed looks like 15.0 and 15.1 repos are currently broken, but 15.1 is
> no longer supported anyway since end of January 2021 ...
> 15.2 and TW repos are working. You need to be aware that directories on the
> webserver are not browsable! Nevertheless they are working as repositories. 
> A driver update for the repositories is triggered since end of last week. So
> things will change soon anyway.

Repos were browsable until last week....

Here on Leap 15.2, they are working:
LANG=C zypper se -s nvidia-compute
Loading repository data...
Reading installed packages...

S | Name                       | Type    | Version              | Arch   |
Repository
--+----------------------------+---------+----------------------+--------+-----------
  | nvidia-computeG04          | package | 390.141-lp152.8.1    | x86_64 |
nvidia
  | nvidia-computeG05          | package | 460.39-lp152.34.1    | x86_64 |
nvidia
  | skelcd-EULA-NVIDIA-compute | package | 2020.05.04-lp152.1.1 | x86_64 | OSS