Hello.
Archlinux replaced ttf-freefonts by gnu-free-fonts.
See this changelog: https://git.archlinux.org/svntogit/packages.git/commit/trunk?h=packages/gnu-free-fonts&id=fa6982ecc671f34eb63b2d83d24fb18752a31c8c
And proposed commit for installer: https://github.com/endeavouros-team/archiso-offlineinstaller/pull/7