It's very optimistic to say the least...maybe the OP was assuming the shooter is just a really poor marksman, or using a BB gun?
That said...I'd take being shot by a bullet any day compared to being shot by a modern bow/crossbow. Definitely a better chance of surviving the bullet.
The stat might reflect reality. But reality reality probably includes a lot of people shot in extremities and shrapnel bouncing back from steel targets.
If someone is shooting to stop a threat they're probably gonna have better than 5/1000 odds of permanently stopping the threat.
That said...I'd take being shot by a bullet any day compared to being shot by a modern bow/crossbow. Definitely a better chance of surviving the bullet.