Of course, under the right, totally-ideal circumstances, your skin would be enough to stop a bullet, especially if it was no longer balistically stable, had ricocheted or got slowed down punching through foliage. I don’t think anyone doubts that.
And on a long enough timeline, probably more than one soldier’s thanked his Zippo for catching a round or some shrapnel or whathaveyou.
So Tao splits the difference and uses a .22 LR rifle. Seems legit.
Just one more reason to carry fire on you at all times.