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It definitely does not support HDR in the YouTube app. It doesn't activate HDR at all. 4K 60, but not HDR. If you are forcing HDR through the settings on the Apple TV it'll show as HDR on your TV, but it's not getting HDR metadata from YouTube. It's…
That HDMI photo is poorly photochopped. Don't even need to run it through Curves or anything to see that.