It can be seen even on GN. Even Dominic Cummings has admitted that the £350million figure was more or less plucked out of thin air and was misleading, but time and time again somebody will pop up on GN (and elsewhere) and use the figure as justification for leaving the EU.
I could produce a very long list of things people believe in, but are actually not true, but it doesn't appear to make any difference. VoteLeave won the referendum because it appealed to emotions and prejudices, which was a deliberate strategy. Cummings, Gove and Johnson knew that people aren't interested in boring facts and figures, so they appealed to populist gut feeling. It was a gamble and they won. Cummings has even bragged about it.