[packman] libheif not available?

[Giacomo Comes]

Hi,
in the essential repository there is the libheif package (recently updated).
If you look in http://ftp.uni-erlangen.de/packman/suse/openSUSE_Leap_15.4/Essentials/x86_64/
you will see the file: libheif1-1.12.0-pm154.5.1.x86_64.rpm
However if I do: zypper in libheif1-1.12.0-pm154.5.1
I get: Package 'libheif1-1.12.0-pm154.5.1' not found.
The reason is that such package is not listed in: repodata/primary.xml.gz
The question is why?

Cheers,
Giacomo