almost 4 years ago - /u/Jagex_Stu - Direct link

Technically that's correct (the best kind of correct).

You've completed the old version of Death Plateau, but you can still complete the reworked version of Death Plateau.

When Death Plateau, Druidic Ritual and Wolf Whistle were reworked for the Troll Warzone tutorial, they decided to make it so if you completed the old version of the quests, they still counted as complete so you wouldn't have to complete the new version.

Which is understandably confusing and breaks certain things (eg the adventurer's log webmodule doesn't support that branching logic), so I'd recommend taking the five minutes to complete the reworked quest.

But you should still be able to Trollheim Teleport to GWD if you've completed Eadgar's Ruse. (And have the skill req to pass the Boulder of Doom.)

Out of curiousity, what's your Slayer task? There might be somewhere easier to access than GWD that contains that monster.