This guy says that the stimulus was very clean and defensible spending. Just because it wasn’t fraud doesn’t mean it was well spent. I don’t think there were even many people saying the program was actually fraudulent. The question of waste isn’t a GAO determination. It’s a political and normative characterization, so I am not convinced on that.
Also apparently, the guy is a Keynesian, and he wishes we would have made the stimulus a lot bigger and spent it immediately and less carefully. There are a lot of smart Keynesians out there, so whatever. But, there are a lot of smart other kinds of economists, and nobody’s proven the multiplier effect yet or learned everything about it. So, that’s the limit of this guy’s persuasiveness.