/usr/share/livecd-rootfs/live-build/ubuntu-touch/includes.chroot/etc/lightdm/lightdm.conf.d/90-phablet.conf is in livecd-rootfs 2.525.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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autologin-user=phablet
greeter-allow-guest=false
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