I don't think the Harmony uses RF to control devices. It sends RF to the hub, and then the hub uses wifi, IR, or bluetooth to control the devices.
The elite can also send IR out via the remote as well, but you have to configure that in the settings. However, I'm not sure if that is the best way to do things if you are gonna use voice control like Alexa to turn things on. Probably best to use a blaster connected to the hub to send IR to the TV for voice control. No idea if the remote still sends out IR from a voice command, and what are the chances it is even pointed at the TV while on the docking station?
If the TV is not receptive to wifi while in an off state, that would explain why the TV does not come on but will still turn off. Of course, this could be a discreet code thing with TCL too. Don't know anything about that.