He is an iconic player, but he does use the hand wobble to produce vibrato. I can't find the YT video I was watching where it was even more apparent. If I can, I'll post it here.
I disagree about your definition of vibrato. It 'finishes off' a note especially for a British cornet sound, but it is also very prevalent in many other genres. Vibrato is to do with style, not disguising out-of-tune playing.
Have you ever heard Enka?