In all ebuilds in ::gentoo for this package, HOMEPAGE and SRC_URI use https://github.com/Russell91/sshrc as the base point, but the corresponding GitHub repository is no longer accessible.
It seems that the repository's successor is https://github.com/cdown/sshrc. Fixing HOMEPAGE and SRC_URI is quite trivial and I could've submitted a PR updating them instead of this bug ticket, but I'd like someone else to affirm that this *is* the new repository for the package. So, please confirm. Thanks!
The source archive is mirrored by Gentoo so this package can still be fetched, unless GENTOO_MIRRORS="":
# env GENTOO_MIRRORS="" ebuild /var/db/repos/gentoo/net-misc/sshrc-0.6.2.ebuild fetch
>>> Downloading 'https://github.com/Russell91/sshrc/archive/0.6.2.tar.gz'
--2021-10-19 20:16:27-- https://github.com/Russell91/sshrc/archive/0.6.2.tar.gz
Resolving github.com... 126.96.36.199
Connecting to github.com|188.8.131.52|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2021-10-19 20:16:27 ERROR 404: Not Found.
!!! Couldn't download 'sshrc-0.6.2.tar.gz'. Aborting.