Yep, that NBC guy was the first to say it was coming and also first that it wasn’t coming.
This, from your link:
"Wikileaks has abruptly canceled a much-anticipated announcement on Tuesday, according to NBC News. The announcement had been expected to be founder Julian Assanges long-promised document dump on Hillary Clinton.
NBCs Jesse Rodriguez reported that the Tuesday announcement which was to come from the balcony of Londons Ecuadorian Embassy, where Assange has sought sanctuary for years was canceled due to security concerns.