Separate from the protest, I am confused how this is not runner interference. The runner seems to even have a foot on the grass. Of course the throw was not good, you can see the runner in the path and how Pujols has to stretch his glove out to get around the runner. And the catcher has come a step or two out from home plate also to try and get around the runner. That's why it was a bad throw.
What if the throw had hit the runner in the back? Any different ruling for that?