Brutus seemed to believe that a federal govt would deprive the states of all sources of revenue (”There cannot be a greater solecism in politics than to talk of power in a government, without the command of any revenue.”). Duh.
He was right. If the national government, ever expanding, were not eating up so much of the substance of the people, the states might actually be solvent! And since the states are subservient to the national government, they can’t do a thing about it.
About that “perversion” of implied powers. Explain to me how George Washington, Alexander Hamilton, and John Marshall “perverted” implied powers doctrine.
The point is that the national government is a complete government, with control of the purse and the sword. Those are not debatable points. At the time, there was some pretense that the new system retained some confederated aspects. Brutus correctly diagnosed that as false.