Business Insider parent Axel Springer said it’s investigating the outlet’s “processes” after billionaire Bill Ackman questioned the motives behind its reporting that his wife Neri Oxman plagiarized in her 2010 doctoral dissertation at MIT. Axel Springer said it’s going to take “a couple of days” to “review the processes” around two Insider stories related to Oxman, a spokesperson for the German media giant told The Post. “While the facts of the reports have not been disputed, over the past few days questions have been raised about the motivation and the process leading up to the reporting — questions we take...