Business Insider’s top executive and parent company said Sunday they were satisfied with the fairness and accuracy of stories that made plagiarism accusations against a former MIT professor who is married to a prominent critic of former Harvard President Claudine Gay. “We stand by Business Insider and its newsroom,” said a spokesman for Axel Springer, the German media company that owns the publication. The company had said it would look into the stories about Neri Oxman, a prominent designer, following complaints by her husband, Bill Ackman, a Harvard graduate and CEO of the Pershing Square investment firm. He publicly campaigned...