Thanks for posting, Scott!
The Hero Attribute Tile that’s briefly mentioned in the other thread is usually the preferred way of going about this. You can find more details on how to change to the Hero Attribute Tile layout in the following help article:
Tagging @James on this one. I don’t think there’s a way to do this directly in the Rule Engine today, but there’s a feature request open for Math with Variables if you wanted to cast a vote on that.
That being said, there may other ways to achieve what you are looking for depending on what devices are being used and what’s setup. For example, there may be a device integration for your TV that could be used to more directly identify the TV state.