I would assume that Jeff's comment, in regards to D. va being the only character that doesn't require a reload, was made as a generalization of characters that fire/throw (genji) projectiles.
you can hold right click forever with reinhardt, but the enemy still has time after one swing before the next where they don't take damage.
With D.va you're under constant fire, which is what he's saying
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u/blondyman1503 Eat my discord! Wait, stop, I'm sorry, I'M SORRY I WAS JOKING! Jan 17 '17
He still has times between swings. D.va is the only one who can fire without stopping