The inaccurate thing about Bernie's statement was that he cited U6 as a measure of "unemployment" when it would more accurately be called a measure of "underemployment". It includes people who want a full-time job but can only find a part-time job even though they aren't fully unemployed.
Trump cited 100% - labor force participation rate as a measure of unemployment, which is complete nonsense because it counts people who are full-time students or who are disabled as unemployed.