It appears it is missing the center sleeve that encases the mounting bolt. The sleeve should tighten in between the upper and lower bracket "ears". There should be a washer on one end of the sleeve, also.
Something is wrong there for sure! My 69 A has no washers, the inner sleeve should be hard captured between the K frame mounts! Assuming the inner sleeve is present, I would retighten that pass through bolt with some serious effort! Otherwise that Idler is Pure junk! There may be other issues your video did not capture as well!