Maybe this will explain something:
https://discovery.endeavouros.com/pacman/automatically-ranking-the-mirror-list/2021/03/
eos-rankmirrors ranks the mirrors in the list of EndeavourOS mirrors
(see file /etc/pacman.d/endeavouros-mirrorlist).
Ranking means ordering the list of mirrors so that the “best” mirrors are written into the beginning of the mirrorlist file.
Mirrors can be ordered by age (i.e. what’s the update level of a mirror) or speed (how fast files can be fetched from a mirror).
eos-rankmirrors orders mirrors first by age, then by speed.
This means the mirrors with the latest package versions will come first in the list. Mirrors with the same update level will be ordered by their speed.
In your picture eos-rankmirrors writes a *.pacnew file which you may want to merge to your existing enedavouros-mirrorlist file. It is a good idea to merge, but don’t do merging blindly. Check which lines might be better in the new list and merge them.
If this sounds challenging, usually it is OK to simply skip merging. Or you can ask here for more instructions.