Right, no current Roku responds to any power commands, the power button on the Roku remote is TV power button. You can set the Roku to go to sleep in the settings after a while, where any press of a key will awaken it.
Edmund
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.