@robertapple1 - very interesting. I always thought all the homekit/airplay functionality was performed over IP. It looks like it may be a combo of both IP and bluetooth. To test this theory, I disabled bluetooth control of the TV and I was no longer able to turn it on via homekit, but the odd thing is, I was able to turn it off, change inputs, and still airplay. Leading me to believe when the tv is in low power mode or where a user would consider the state "off" it uses bluetooth to wake it, then controls when it's consider in an "on" state are sent via IP. This may explain why control is reliable and seen in homekit with no issues when on, but when "off" or in a low power mode showing the not responding in homekit because of bluetooth issues.
This also makes me wonder how bluetooth control is handled to the tv when commands are issued by say homepods. I have multiple apple tvs and home pods around the house acting as homekit hubs, which to me thinks I would have a reliable bluetooth connection to monitor the tv state and should never see the not responding while "off". I wonder how we can further troubleshoot this or if anyone knows how homekit handles bluetooth devices.