Another strange unknown device

Given #3 I would correlate the power meter for the Samsung TV on the Kasa plug with what you are seeing for what Sense thinks is “Samsung TV”. Then tell Sense that the Samsung TV is plugged into the Kasa.

Regarding #4: The Mains Power Meter (your overall power) is something you can trust to be showing you actual electrical usage. A given device power meter can only really be trusted if it’s for a smart plug.

Here are some TV stats, an LG OLED connected to an HS110 smart plug. This is available under a Device assuming it’s been detected for long enough.

Your post has prompted me to realize we need more TVs in the Community Device Library. I’ll post mine soon.