Whether he happens to be correct or not (a broken clock is right twice a day), Krugman has zero credibility. He has a Nobel Prize, so people listen to him, but the man is a dyed-in-the-wool Keynesian who takes no responsibility when his prognostications fail to materialize again and again.

Where are the specific examples, you ask? There's an entire podcast devoted to smashing his (often-contradictory) arguments: https://contrakrugman.com/