yeah, 3 years was a miss interpretation of mine. I looked in the wiki and there its says something about Path of Fire... but if I look more close I see that it was added in Episode 6 of Living World Season 4, War Eternal, which was released May 2019. Sorry for that miss information.
I still wonder why ANet does not create these skins - they would sell. And I do not think that this is a lot of work (expensive), because they just need to adapt the skins & effects to a new 3D model. Sounds for me like a few days workd for a designer...