One of the interesting things about the article is that among the economists cited as being among the critics of "Keynesianism," you find the names John Taylor, Robert Mundell, and Kenneth Rogoff. I find that list interesting because if you follow the links I attached to those names you will find work with models that are decidedly Keynesian in structure. Works by Taylor and Rogoff are, in fact, seminal contributions to the "New Keynesian" paradigm that dominates macroeconomics today.
As far as I know, none of these men have repudiated the basic worldview that motivates the referenced work. In fact, as recently as last year John Taylor approvingly described, as he has many times, a key characteristic of the paradigm for monetary policy that was in place the decades before the financial crisis:
"… the central bank has a strategy, or rule, to adjust the interest rate depending on economic conditions: In general, the interest rate rises by a certain amount when inflation increases above its target and the interest rate falls when by a certain amount when the economy goes into a recession."
I added the emphasis to the last part of that passage as it is a feature of the so-called Taylor rule that is entirely built on the foundation of the New Keynesian model.
How, then, to explain the Keynesian predilections of the economists mentioned as presumed carriers of the anti-Keynesian mantle? The source of the confusion, I think, goes back to the historical, but somewhat obsolete, distinction between so-called Keynesianism and monetarism. The latter was, of course, personified in Milton Friedman and his dispute with what was the orthodoxy in the three decades following the Great Depression. Lost in the early-days labeling, however, was the fact that the disputes were more about the empirical details of theory rather than the theory itself.
In particular, Friedman did not deny the effectiveness of policy in principle but rather its wisdom or impact in practice. This sentiment is exactly the one he expressed in his prescient and transformative 1968 presidential address to the American Economics Association:
"In the United States the revival of belief in the potency of monetary policy was strengthened also by the increasing disillusionment with fiscal policy, not so much by its potential to increase aggregate demand as with the practical and political feasibility of so using it."
[…] My point is not to dispute or defend the truth of the Ricardian proposition. My point is that it has absolutely nothing to do with whether one believes (or does not believe) that the New Keynesian framework is the right way to view the world. The essential policy implications of the New Keynesian idea (like the old Keynesian idea) is that changes in gross domestic product can be driven by changes in desired spending by households, businesses, foreigners, and the government in sum. You can believe that and still believe in fiscal policy ineffectiveness, as long as you believe that total spending is unaltered by a particular policy intervention.