Just reading this
There’s a catch. (Of course.) Dolby Vision Profile 8.4 is a new version of Dolby Vision, and that means a bunch of older Dolby Vision gear out there needs to be updated to support it. So I can’t promise you any random Dolby Vision TV with AirPlay 2 will play back iPhone 12 Pro video in Dolby Vision. You’ll have to check to see if your TV supports Profile 8.4. Dieter’s older Vizio P65 has AirPlay 2 but played back iPhone 12 Dolby Vision video in SDR. My 2016 LG B6 OLED supports Dolby Vision but not profile 8.4, and it wouldn’t play an iPhone 12 video file from a USB stick at all. It’s also old enough now that it’ll probably never get another software update to do so. And so on.
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Doesn't play back HDR content just UHD without the HDR