I'm not sure it does. The article you linked even said that the club barely registers outside Latin America yet they manage to be the 15th most popular club in the world? The social media presence on that list is heavily dictated by Latin America. These figures don't line up with TV figures. PL is the most watched league by far and the correlation between people watching the league on TV, attending games doesn't line up with social media likes. And you absolutely have to take into account how popular each social media platform is per country. Brazil is a huge country and it's the country that has the 6th highest percentage of users. Brazil is 2nd in terms of Instagram users and 4th for Facebook. Of course those numbers add up. Turkey is 5th on Twitter, 6th on Instagram and 10th on Facebook and look, Galatasaray is on the list of top 15 clubs. Spain and Italy don't register on the top 10 in any of the lists, Germany and UK only some.
What the social media chart also doesn't take into consideration is the age of the profiles. For Real Madrid the numbers are based on multiple Twitter accounts, not the one like with United. How many of the accounts are bots and not real people? Purchasing likes is a thing you can do.
A small anecdote of how social media is so much bigger in Latin America. An Icelandic player went into the WC with about 10k followers. After the WC he had more than 1m and the data showed that it was mostly just Argentina and Brazil. Basically thirsty women who wanted to look at him. He's more of a model now than a footballer because of that tournament.