Lots of things are rare in baseball. A third strike passed ball that ends up with a runner on first, for example. A triple play. A hit batter with the bases loaded. Stealing home.
An inside the park home run is usually due to a lucky bounce (as was the one by Pagan).
That's not nearly the same as getting every batter out in a 9 inning game.
I'm not saying it isn't exceptional, but one play vs. 9 innings is really no contest. A completely different level.