It’s official: David Ortiz’s slump was not because of Globe columnist Dan Shaughnessy asking Ortiz whether he was on steroids. Ortiz revealed that he has a sore left oblique which he’s been dealing with as far back as the Texas series in Arlington. Ortiz laughed and said, “It had nothing to do with that article. I’ve had this problem for a while now and it’s something that affected my swing for a while.” Ortiz first mentioned the injury to ESPNDeportes before Tuesday night’s game against the Rays.