I’m out at dinner and on mobile, so I’ll have to get back to this later. But you can find info on worgen deathknights here.
Worgen deathknights can shapeshift, as there is an instance in the Brawler’s Guild where a worgen deathknight uses human form.
Worgen deathknights are not all kaldorei worgen. In fact, the player character’s friend has a human name. Arugal summoned a handful of kaldorei-worgen including Alpha Prime, bent the knee to Alpha Prime, and together they started spreading the curse to humans of the region.
You could certainly be a kaldorei-worgen deathknight, if you want to. But theres nothing saying you have to be, and “playable” worgen dk’s are former humans and are able to transform.
