[UPDATE]
Today, got reply from Ludovic Courtes.
This is the most relevant part from his mail; (Unedited.)
AIUI, Unetbootin creates USB images from ISO images. Currently we
provide USB images of GuixSD, so presumably nothing is needed on that
front.
Creating ISO images of GuixSD should be doable but requires hacking in
Guix itself. We haven’t done it yet, mostly because it seems that most
machines can boot on USB nowadays, but less and less have a CD-ROM
drive.
Please use guix-de...@gnu.org for future correspondence.
So, perhaps someone needs to check the source code and supply appropriate USB
image, for GuixSD to work properly.
