I have this same issue with my brand new 54.0 remote. There doesn’t seem to be a way to turn off JUST the receiver any more. Even when selecting the DISH input on the side then pressing power, it turns off my TV and brings up the message about standby mode.
I have been told repeatedly that this is a new “feature”. I can’t fathom how this is beneficial as it creates an issue for anyone that has more than just the DISH receiver plugged into their TV. Even a supervisor told me this is a feature. So you’re forced to wait through the inactivity period if you want your receiver to go off. This is because even if the message about standby comes up, as soon as you press TV to switch inputs, it turns the receiver back on. All I want is a way to turn off JUST my dish receiver like I can without issue with my 52.0 remote.