Um, for exactly the reason I said? It could simply be a test where they are seeking to see if they will get a decent amount of views and possibly expand to have more spanish speaking content targeting, there Spanish speaking fanbase. Not that had actually. And it's not like the video showed ground breaking/exclusive content you could not find in english, so it's not like English viewers missed out or something important. Check out AC Milan's main twitter page. They tweet in Italian, English and even islamic and chinese depending on who(audience) they are targeting. No one gets upset about it.
They don't claim to be either. I always find these threads hilarious because moat people's misconceptions about PFF are pretty funny. Not even hard to find/figure out how their grading works and how to actually apply it(context).