1) It's from 2020
2) Just a video isn't proof enough.
3) It could be just visual as it is with many mods for mmorpgs.
4) It's not entirely impossible, but it's probably not worth the time for most modders.
I don't create mods anymore since 1,5 years or something like that since i got no time for that and other modders need to be interested in this.
Most modders on a level who are able to create mods for mmorpg decide on their own what they wanna mod.