only the congress has constitutional authority to spend money.
The article mentions the HEROES Act which apparently transfers some legislative authority to the executive branch. That action would certainly be unconstitutional. A current Congress cannot vitiate the stipulated Constitutional authority of a future Congress, which exists separate from the current one. If this was the case, a current Congress would be MORE powerful than a future Congress, which is just a ridiculous concept. If the HEROES Act was legitimate, it would have to sunset at the end of the Congress that authorized the act.