According to the linux-libre team in the #gnu-linux-libre IRC channel on Libera.chat, all releases of linux-libre before 4.4.282, 4.9.281, 4.14.245, 4.19.205, 5.4.143, 5.10.61, and 5.13.13 will be deleted from their servers, and their Git repo is also going to be rewritten to remove them.
So, if anybody wanted to build old versions of Guix System (or linux-libre based on old revisions of guix.git), some third party should preserve and mirror those files and the Git repo: https://linux-libre.fsfla.org/pub/linux-libre/releases/ git://linux-libre.fsfla.org/releases.git The reason for the removal is that some nonfree things were accidentally not removed by the previous releases of the deblob scripts.
