So this is from an episode of Animation vs Minecraft Shorts from long ago where the Warden has a flashback of the time where the cities weren't corrupted yet and full of people and the Warden is less infected by the sculk and I've always wanted this skin to be into the game so I "recreated" it myself using the few seconds we see this version of the Warden.
This skin isn't official or cannon to the story of Minecraft and it isn't the real design from Alan Becker and his team I recreated it as best as I could.
I recommend using the texture with this ressource pack ( https://www.planetminecraft.com/texture-pack/warden-iron-golem-texture-pack-optifine/ ) that changes the default iron golem into a warden when nametagged so and if you change the warden texture used in the pack with this skin then there's gonna be an old Warden inoffensive to the villagers just like in the video.