Trump suggests all sorts of things, often directly contradictory, or contradicted shortly thereafter by his own experts. I'm not sure why you'd put any stock in those suggestions at this point.
Trump acknowledges he defied the experts and potentially wasted a bunch of money.
What, exactly, are you imagining is the scandal here? That Trump is lying, he didn't defy the experts, and the potential wasting of money was the fault of experts and not Trump? Is that the scandal you're imagining?