I'm not so sure you should dismiss him so out of hand Atmjjc.
You forget how desperate these guys must be to finally get this in the open. He appears to have handled the talks with them very cleverly and built up a strong bond of trust. They know time is running out.
The stuff about the nuclear weapons seems wrong to me. From what I've read they've been clearly warning us off nukes for years.
Turning off icbms , putting them in launch mode but never firing them, which wouldn't be so much harder would it? If they had we wouldn't be here talking about it. They have mostly just buzzed them. The stuff about the 'others' giving us craft is what I've always suspected. There was never a mention of good ETs vs bad ETs and I think the reason is that they took any alien life form , as unreadable and unfathomable, especially thier motives and out of simplicity labelled them all as a potential threat.
Who knows reckon it will be a while before we figure out if this is for real.
I do hold George Knapp in great esteem and if he's backing it gives it a whole lot of weight.