But, these experts say, the government’s accomplishments, and its credibility, are being undermined by overly rosy projections that did not take account of the vagaries of vaccine production, making it look as if the vaccine effort is failing. ---taken from New York Times
To my way of thinking, as "making it look as if....." is a modifier of "the vagaries of vaccine produtiion", the comma should be dropped. If not, it would make the sentence more awkward. Your opinions would be deeply appreciated. Thanks.