The Yamaha 5600 also decodes them as well and it has been out for a while. Unfortunately, it has the older lower bandwidth 10.2gbs HDMI chips instead of the newer 18gbs chips. So while it has HDMI 2.0 and HDCP 2.2 and handles 4K it can't handle 4K with HDR. You can work around this limitation if your Blu-ray player has two outputs or adding an HDMI splitter to your player if it only has one output. Anyway, thevrep was incorrect that there are no other bars that decode Atmos and DTS:X.
Also, while you can have the player decode the lossless format to LPCM and you will still get lossless sound but you will not get Atmos or DTS:X. To get those the sound bar needs to decode the bit stream version of those formats, Atmos/DTS:X information is not converted to LPCM.