I was dove hunting with a .410 when I was ten years old.
Same size shot as was involved here.
And if I had hit someone squarely enough with the shot to penetrate skin and send them to the hospital, I doubt my dad would have called it anything other than shooting them.
While I've heard of plenty of people getting peppered with birdshot (albeit some needing to go the ER to prevent infection, etc.), no one who I know that's been peppered has ever needed surgery or had internal organs penetrated.