.265 MKVs that is. And it have menus(probably crude menus, but at least a list that orders the files and has a description for each) and so author it in this way so that a future player might be able to play it just like a blu ray (probably made by whoever wrote the burner software?
It can burn a XL disc but not author a xl menu with HEVC.
Unless you can show me where. I looked it over good and did not see that. I even downloaded the trial and ran it, there is no option for 4K discs and no option for .265 encoded video.