Well that announcement wasn’t going to shut up Tony’s mind. Gibbs thinking it was nineteen ninety one means he hadn’t joined NCIS yet, hadn’t met Tony and Harry yet. Tony and Harry hadn’t even met yet! Sure Tony knew about "Harry Potter’ at that point. All magicals in Europe knew about the name Harry Potter. But the idea he’d even meet the legend - let alone fall in love and marry the man - was a fantasy.