This file is indexed.

/usr/lib/os-probes/mounted/70hurd is in os-prober 1.63ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e

. /usr/share/os-prober/common.sh

partition="$1"
dir="$2"
type="$3"

if [ -e "$dir/servers/exec" ] && [ -x "$dir/hurd/init" ]; then
        label="$(count_next_label Hurd)"
	result "$partition:GNU/Hurd:$label:hurd"
	exit 0
else
	exit 1
fi