Whether Obama is "technically" president or not, he ain't much of an expert on whether human beings are "technically alive or not." Above his pay grade, as he readily admits.
Osama’s been dead for years and years. I think Obama slipped up by saying “technically”. It leads me to think that the national security briefings told him the truth, but also stated that the American people still need a boogeyman. The Bush administration never came clean on this, and continues to maintain the fiction. So Obama slipped up by implying that Osama is perhaps fictional.