Hi Greg,
I'm sorry to say I don't think it does work.
My system is now not clean installed but it does not appear there is an output device.
I added "dtoverlay=vc4-kms-v3d,noaudio" to config.txt in order to get the Video output working, which it did.
To test for you I removed the ",noaudio" from config.txt and rebooted
I then set SL to use HDMI via Web Gui and rebooted
after reboot SL was not running.
I SSH'd in :-

Not sure how the HDMI should show up (I've never used or been interested in it) but I don't think its here
Jeff
I'm sorry to say I don't think it does work.
My system is now not clean installed but it does not appear there is an output device.
I added "dtoverlay=vc4-kms-v3d,noaudio" to config.txt in order to get the Video output working, which it did.
To test for you I removed the ",noaudio" from config.txt and rebooted
I then set SL to use HDMI via Web Gui and rebooted
after reboot SL was not running.
I SSH'd in :-
Not sure how the HDMI should show up (I've never used or been interested in it) but I don't think its here
Jeff
Comment