He’s obviously saying they knew it was coming because HE knew it was coming as he called it in his books over a year prior. He’s not just blowing smoke and saying that they were in on it (which is what the conspiracy theorist say)
Since Trump knew that airplane attacks on the twin towers, pentagon and white house/congress were coming and didn’t tell anyone, then he is at fault for the 3,000 dead. And the survivors and next of kin should sue him as being an ‘aider and abettor’ in the attacks.
to say ‘I knew an attack was coming because Osama had threatened attacks and was behind the 1994 tower attack’ but didn’t know when, where, or how, is just bluster.