If anyone here could offer a bit of clarification on this then I'd be grateful. Rather confused. Haha

Here you go info straight from Nvidia:

https://www.nvidia.com/en-us/geforce/forums/shield-tv/9/324929/why-no-vp9-profile-2-in-new-shield/2301821/

What that also means is no 4K HDR Play Movies either because Google also encoded that 4K HDR content using VP9 p2

PS. VP9 p2 is what you have to look for in "Stats for Nerds" function that then activates the YT Popup overlay.