I found my proof finally..
The TV was advertised/Speced (in New Zealand) to be upgradable (words "can be upgraded") to HDMI 2.0 to play 4K/60p content via the internet. (This was before I got it and one of the reasons I got the TV -the ability to watch 4K/60 Content on the TV. )
The only devices which will play 4K/60P content via HDMI 2.0 need HDCP 2.2.
Glad you found proof, as they can't really dispute advertising of a feature that isn't correct, and that is dated prior to the purchase date. Don't you love that feeling when you have the eureka moment.