From my perspective, the pic that I provided is all that the average user would probably take into consideration. I'm guessing that most of the people that are blowing up about this are people who are part of DA or at least visit the site on a regular basis. For me, I only go there occasionally and have no idea how the site works, so what I saw on that page is what I thought was the official rules. Think about it from a perspective of someone saying, "Hey! Check out this contest LP is having," and then they link the deviantart website and those same people see what I linked. The undeniable truth here is that even if the official rules were floating around on the official Linkin park site (which I didn't even know about because I NEVER go to Linkin Parks official site for anything anymore), they should have been clearly visible on the DA site as well.
Anyways, I'm probably not contributing much by spitting the same opinion out over and over. I am basically just pissed off at everyone who are saying hateful things about this persons artwork as a result of their frustration from a flawed system. If the person comes out and says, "HA HA! I PURPOSELY SUBMITTED THIS MANY PIECES OF WORK SO THAT CHESTER WOULD SEE MY POWERFUL PHOTOSHOP SKILLS OVER ALL OF YOURS! HA HA!" that's a different story. Until then, people should take into consideration that they may have been just as clueless to the official rules as I was along with many others.
Edit:
Well, there's the problem that caused this outrage. It's invisible for me too. I would have never guessed that was even there.