No, the UniFi Next-Gen Gateway Lite doesn’t work with the CloudKey gen1 / v1

They did it! They found a way to kill the CloudKey v1.
You cannot adopt the UXG-Lite with my Unifi Key UCKV3 1.1.19 out of the box!

even when trying manually to force update the Unifi software on the CloudKey it errors out

rm /tmp/unifi_sysvinit_all.deb &> /dev/null; curl -o "/tmp/unifi_sysvinit_all.deb" https://dl.ui.com/unifi/8.0.7/unifi_sysvinit_all.deb && dpkg -i /tmp/unifi_sysvinit_all.deb && rm /tmp/unifi_sysvinit_all.deb

root@UniFi-CloudKey:~# dpkg -i /tmp/unifi_sysvinit_all.deb 
(Reading database ... 26674 files and directories currently installed.)
Preparing to unpack /tmp/unifi_sysvinit_all.deb ...

********************************* NOTICE **********************************
* This version of the Network Application is not supported on your Gen1   *
* UniFi CloudKey (UC-CK). The latest supported version on your CloudKey   *
* is 7.2.x and older. Please reinstall the latest 7.2 release using the   *
* command below:                                                          *
*                                                                         *
* sudo apt-get install --reinstall unifi                                  *
***************************************************************************

dpkg: error processing archive /tmp/unifi_sysvinit_all.deb (--install):
 subprocess new pre-installation script returned error exit status 73
abort-upgrade: please reinstall previous version

sudo apt-get install --reinstall unifi=7.2.97-18705-1

dpkg: error while cleaning up:
 subprocess new post-removal script returned error exit status 2
Errors were encountered while processing:
 /tmp/unifi_sysvinit_all.deb