The claim is a statement about Nigel Farage’s personal preference or state of mind (“I love that system”), not an independently observable fact. Public evidence can confirm that he said this in the interview, but that does not let us verify whether he truly felt that way at the time. So this is not publicly corroborable in the way a factual claim about the world would be. Sources: High Profiles interview with Nigel Farage (https://highprofiles.info/interview/nigel-farage/).