Back in September, it looked as though AT&T was set to gut its ad tech division, Xandr, as part of a drive to slash $10 billion in asset sales. Faultline noted at the time that many of the issues that plagued the company were in its video and media operations. Not only was Xandr built out of a display advertising business; it was too closely tied to AT&T’s WarnerMedia, meaning many of its prospective clients – large studios, networks and D2C video platforms – were unwilling to use a long-form video ad exchange owned by a competitor. Since then, AT&T has reinstated its faith Xandr, and seems to be plowing ahead with a questionable two-pronged advertising strategy, pursuing both TV…