

The documentation has long since been changed.
Note that the anon user is able to become root without a password by default, as a development convenience. To prevent this, remove anon from the wheel group and it will no longer be able to run /bin/su.
https://github.com/SerenityOS/serenity/commit/a2a6bc534868773b9320ec3ca7399283cf7a375b (this seems to have also switched to gender neutral language in other parts.'of the documentation and comments as well).
Original drama: https://github.com/SerenityOS/serenity/pull/6814
[moonpie@osiris ~]$ du -h $(which filelight) 316K /usr/bin/filelight
K = kilobytes.
[moonpie@osiris ~]$ pacman -Ql filelight | awk '{print $2}' | xargs du | awk '{print $1}' | paste -sd+ | bc 45347740
45347740 bytes is 43.247 megabytes. That is to say, the entire install of filelight is only 43 megabytes.
KDE packages have many dependencies, which cause the packages themselves to be extremely tiny. By sharing a ton of code via libraries, they save a lot of space.