It seems like that article is taking a political position, so I'm not so sure how much credence to give it. I mean that's the closing sentence of his first paragraph. To base the article on the complete dismissal of the Keynesian school of thought isn't very inspiring.
Ya, looking at his portfolio, he's certainly a political shill. He's written some sketchy articles such as "Why Deregulation Is Essential To Restoring Booming Economic Growth, And The American Dream," "President Obama's Plan To "De-develop" America Shifts Into High Gear," "President Obama's Global Warming Calculated Deception Means Democrats Have Abandoned Working People," as well as promotes the return to the gold standard. I wouldn't use him as a primary source.
https://www.forbes.com/sites/peterferrara/#283999473eb5
He's also a director at the Heartland Institute which is a conservative "think tank."
It's also worth noting that there's a real deep division in economics between the "Freshwater" and the "Saltwater" types, and it's important to know which kind of economist your reading. He's of the "Freshwater" type so he's going to be Anti-Keynesian, but that's okay.
Lastly, it was written before 2014 so everything changed after Thomas Piketty wrote "Capital in the 21st Century".
Yes, I don't dismiss political points of view outright, but the language he uses and the phrases he uses, it's fairly obvious he's trying to convince the reader of his position by discrediting the education of the counterpoint rather than using points of his own. It's intellectual dishonesty wrapped in a false shroud of academia for people who can't tell the difference.
I'll wager free air that if you read is articles over time, he starts to contradict himself depending on which political party is in power. This article seems to be written when the whole austerity thing was going on when the Dems were in office. I suspect now that the GOP is in office, he's ok with government spending, or he ignores it altogether. (actually it appears he's no longer writing for Forbes).
Any position on public policy is a political position. There's no apolitical macroeconomics.