So did this eliminate the old NoBuy?
Do you mean "Admin No Buy"? Yes this plugin supercedes buy for the specified team fully.
And their is no way of "nobuying" a particular person?
My opinion there is a way but it's still not implemented in any plugin fully.
For example "Admin No Buy" which written for that has numerous exploits. Even the latest AMXX Weapon Restriction menu has exploits (EDIT: for now AMXX Weapon Restriction issues is fixed).
I think the steeps in that direction should be:
1. Fixing Weapon Restriction exploits
2. Creating a 3rd party plugin based on the original Weapon Restriction.