I don't have any inside knowledge of the specs. Along with Microsoft, Warner Bros., 20th Century Fox, and Panasonic, Samsung is a part of something called "The HDR10+ Alliance." (I wish I were making this up.) The entire point of HDR10+ is to stop DV and its licensing fees. Adding DV capability would cost Samsung licensing $ & it would also amount to spitting in their partners' faces.
If you could enable "full passthrough" without paying the fee, perhaps Samsung would enable it. But that's not how DV works.
LG B7 65", PS4 Pro, Switch, Roku Premiere+, Samsung K8500, Sennheiser RS185
Denon X4400H, RSL CG23+CG3, Onkyo SKH-410, Emotiva BasX8 (5.1.4)