This file is indexed.

/etc/apt/apt.conf.d/60icons is in apt-config-icons 0.12.0-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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## This file enables the download of small-size 64x64px
## icons for use in software centers like GNOME Software
## and Plasma Discover.
##
## The icons are required for software centers to function
## correctly. Applications without an icon will not be
## displayed at all.

Acquire::IndexTargets {
    deb::DEP-11-icons-small  {
        DefaultEnabled "true";
    };
    deb::DEP-11-icons  {
        DefaultEnabled "true";
    };
};