Question: does hdmi 2.0 support hdr?
Answer: There is no such thing as an "HDR HDMI" cable or an "HDMI 2.0" cable. ... HDMI cables don't have version numbers. The connections have version numbers. So your TV might be "HDMI 2.0a" (and indeed needs to be for HDR), but the cable you plug into it doesn't have a number.