Are these files needed for Ubuntu? They had been there for so long, getting copied from one release to another.
Blankon Tambora was released in February 2014.
gNewSense Parkes was released in August 2013.
Kali is, of course, rolling. Added lately.
Tanglu Aequorea was released in February 2014. Tanglu is discontinued in 2017.
Debian Bullseye is sort of rolling until the next stable release.
But still, for updating/upgrading Ubuntu (and variants) only the two files are needed – Ubuntu.info and Ubuntu.mirrors. So why keep the rest?