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I don’t know where this myth is coming from, that Apple needs the VP9 codec. Google serves their 4K Videos in a second format, which the iOS/ tvOS plattform is capable of.
The now defunct ProTube for iOS plays 4K YouTube. And this is what the developer says.
„If everything looks fine, choose OK.“ (Dolby Vision, HDR10)
NEVER use this option as the complete UI will use the expanded dynamic range and it is not designed for it. Colors and contrast will look dull. Instead leave the resolution at 4K SDR or 1080p SDR and use the options for matching dynamic range and refresh rate. This will give you a normal looking UI and when content has the extra information for HDR10/ Dolby Vision Apple TV will switch to the corresponding mode.