They never said it was original. They just shared some items they made. Some newer people probably find this helpful or if they don’t want to add all the items themselves they can use this. Not every resource out there is going to be super advanced. Just be glad they’re contributing to the forum in a healthy manner than just downloading resources and never saying anything. If you don’t find it useable then just don’t use it 
OP stated where it came from and that it demonstrates ease of use to adding items.
They also have plans to expand on this such as adding animations/props on a per item basis. This is a little tedious since they’d need to find the props and attach them properly to the player.
It’s still a helpful release even if it doesn’t help you personally. Like the McDonald’s items., you can now use those items with the McDonald’s Job. There’s uses for everything by someone. Even those weird admin cars people make.