I would categorize it differently. Rather than just objecting to their policy, he is describing a reason why current policies are suboptimal, and suggesting way

I would categorize it differently. Rather than just objecting to their policy, he is describing a reason why current policies are suboptimal, and suggesting ways that current policies could be improved. Namely, that domestic central banks around the world don't coordinate policy with foreign central banks, despite the existence of major feedback loops between foreign and domestic policy. He hypothesizes that the world economy would be better off if there were more global coordination on monetary policy.