First let's ask, "Does it matter if he's Latino or not?" Yes it does matter because with the estimated 45 million Latino Catholics living in the U.S., you're going to need a reason to make him Latino. There are various news outlets, like the Huffington Post's Latino Voices, calling him Latino in the headline.
BeingLatino raised the question on Facebook and of course there are mixed reactions and even people attempting to identify what is a Latino. One person comments, "Argentinians don't claim Latino. They claim European," while another writes, "He's a Latino without a doubt. He was born in Argentina, which is in South America and where Spanish is the official language." So what is the definition of a Latino? Although a dictionary might say one thing, as a people we could easily say something else.