Sounds like you just skimmed over the review, I answer all those questions in it. Although I admit I did not test if DTS works over the headphones, when I get some time I will test this. My personal use case is more speaker-driven (I cover this in the review too).
It actually does the same exact thing as yours, 7.1 virtual surround over headphones.
From the product page: "Experience sound that surrounds you with 7.1 virtual surround, delivering a wider, more immersive soundstage for movies, games, and music."
So both of them are two channel, with 7.1 virtual surround that only work in Headphones mode.
Enpass has been my goto solution for almost 6 years now (got a lifetime license). Especially as it works 100% offline, independent of whatever browser I use, available on ALL my devices (Laptop/Tablet/Desktop/Smartphone/Smartwatch), and syncs between my devices via WiFi. And with the recent UI upgrade, it looks just-as eye-catching as 1Password used to be before they ruined it all with a stupid online account requirement.
That said, I still wish they'd implement integration with Windows Passkey support, and support for Samsung Internet on Android. Especially now that microslop has eliminated the Edge Sidebar, and Samsung Internet for Windows brings it back, making me eager to install another browser on my Windows system after 6 years of using only Edgium...