In this video I speedrun full netherite armor in under 30 seconds. The final time would be the leaderboard time because the category I had my timer category set to was the full netherite achievement. I also used pogloot during this run which edits chest and mob loot which is how I got 4 netherite and full diamond from one chest.
Enjoy! :D

How this is done:
Install fabric v1.16.1
Download this mod: https://github.com/AbyssStudios/PogLoot/releases/tag/v1.8.2
Load this seed: 4805074911992647
Enjoy your full netherite