The impression that I received from that article was that "hooliganism" was a term referring to a more organized form of sports-related violence, rather than a few morons who had a few too many at a game. If that wasn't what it was referring to, then I was incorrect in thinking that the term wouldn't apply. As for the claim itself, all I really have to go on is what has always been presented in the media over here, wrong or not; it's not like I can just hop over there and see if those claims are incorrect, even if I did have the reason/motivation to do so. All I know is that, in both the media and entertainment over here, this football "hooliganism" has always been given that sort of treatment; even if you turn on one of those "World's Wildest Police Videos" programs that air during daytime cable, you're likely to see at least one European or South American sports-related incident. (For all I know, these videos could be twenty years old, but I've seen them nontheless.) If this coverage really is as incorrect as the article states, then it makes a very good point.
I'll ask you this, as someone who's obviously much more familiar with it than me: exactly how much coverage does sports-related violence receive in your country's media, and is it coverage that is generally accepted or just dismissed as sensationalism? Also, is the whole idea of organized thugs at sporting events just another aspect of the misinformation, or does/did that sort of thing really exist? I can honestly say I've never heard of something like that happening over here, although that doesn't mean it hasn't happened or isn't happening.
P.S. Regarding one specific point the article made, about the Ron Artest fight in the stands during the Pacers/Pistons basketball game, I can tell you that that was in the news and sports talk almost nonstop for at least a good two weeks, so much so that I became extremely tired of hearing about it after the first day or two. The league definitely didn't brush it off as something inconsequential, either.