Your error is a common one, easy to make, and even tempting to make.
I am unmovable from my belief on this issue, and suggest that we just leave it at that, so as to not generate any expression of hostility here on FR, nor bad feelings toward one another aside from what we post.
The constitution put the power in Congress per Article I Section 8.
“To establish an uniform Rule of Naturalization, and uniform Laws on the subject of Bankruptcies throughout the United States;”
To follow the logic put forward by the NBC definition crowd, there would not be uniform rules of bankruptcies because of some extra-constitutional document that defines the word bankruptcies in a manner different from Congress’s definition.