Absolutely when all rounds are gone that's true.
(Sadly that means none of the bullets went straight through, which tells me it was likely a 22lr handgun, otherwise we would have seen rounds pierce the back)
Many people state a 22 is most deadly for that simple fact, it often has the power to enter, but not to leave, so it richochets inside of a skull or ribcage causing more damage than immediately exiting
I didn't say it would do more damage because it was a smaller caliber, I said it would do more damage because it didnt exit. But you fabricated a scenario to say my statement was a myth.