Why does config_hardened.x86_64 only work for outdated kernels?

[Ruttie2006]

The comment on _configfile states: "config_hardened.x86_64" : config file for a hardened kernel, available for kernel version "5.15", "5.13", "5.11", "5.10", "5.7", "5.4".
Why are only these kernel version supported?
Arch linux (which the default config is based on afaik) for example offers a linux-hardened kernel, so a maintained/up-to-date config should be fairly easy to retreive, no?
The comment for default also states 'from the linux-tkg-config/5.y folder', is the comment simply just outdated (since 6.* has been out for a while)?

[AdelKS]

The comment is most definitely outdated, it will work as long as the file linux-tkg-config/X.YY/config_hardened.x86_64 exists

We currently follow this upstream project to fetch the hardened patches https://github.com/anthraxx/linux-hardened/releases, which doesn't ship hardened config files for all kernel versions, it seems only LTS kernels, Arch does the same and ships from the same upstream