There is simply no scientifically credible evidence of any malfeasance. The fact that the government agencies have not come out outright and said as much, can be easily explained by the fact that they have nothing to gain by debunking it.

You can rest assured that there are no longer any CIA agents assigned to investigating the Havana events, because they have long ago concluded that there is no substance to the story. They'll never make a press release about such a non-event.