That just moved them from god-awful to bad and from bad to mediocre. It's a stretch to call that delivering. It's certainly not winning.
Since Rizzo took over the club has improved by 20 games, that is incontrovertible. It's not conjecture, it's not projection, it's not statistics, it's fact.
There is no evidence that the Nats have gotten worse since he became GM. Will the Nats get better? Will they be contenders? Will the owners do what it takes? That is all open for debate.
But the club winning more games since Rizzo becoming GM is not.