I trained the IR code for turning off TV from the original remote control. When sending trained Power off Code manually, RV turnes off, but in the activity it is not happening reliably.
You know that you can use multiple integrations for 1 device? I have a Philips OLED806 with the Android TV integration and switch on/off is working perfect for me.
Another advantage of Android TV is direct start of Apps.
Drawback is that the inputs like HDMI are not working for that I use the ADBTV integration. Another thing to watch is the startup time when it is powered down complete then it takes in my case around 6min before WiFi is active and reachable.