Nowhere does that deny that there are skilled and unskilled players, simply that you believe there are more skill requirements with Brink. Whether or not that is true is not entirely relevant to the situation brought up by the OP as more health and OHKs are directly related to the mechanics of shooters in general.
A player who is skilled at shooting (a skilled player) in FPS games will be able to transition to Brink without trouble because everything about how you shoot is effectively the same. More damage required to kill doesn't level that playing field. He may have trouble getting a grasp on what else he is supposed to be doing in the game as a whole, but not the shooting.
At the same time a skilled RPG player, someone who's skills are based in the quick thinking and organizational areas required for group RPGs, will be able to transition to the right tactical mindset of Brink and do quite well from that position, but he may have much more trouble with the shooting because that is not his skill.
And there are a collection of players that, regardless of the game genre, excel because they have the the various skillsets required across gaming. There are also a collection of gamers that appear "skilled" in certain games within various genres because they know that game so well that they know how to use the game to their advantage, but while they are skilled at that game they are not neccesarily skilled gamers.
First off...
He didn't say MORE skills required for Brink. Different skills required.
Secondly, and also relevant to the first point, there's a difference between skilled at aiming for the opening rounds of a burst, and skilled at keeping steady aim. BOTH are shooting skills, and to an extent, with the right weapons and playstyles, both will probably be valuable in Brink, but you can't just boil both down to "skilled at shooting." MOST games cater specifically, or preferentially at least, to one of those skills. "Skilled at shooting" in the Quake and Unreal games and "skilled at shooting" in the early Rainbow Six games (only played the first few, can't comment on later iterations) are barely comparable. One requires steady aim and effective tracking of a target, the other requires patience and precision for a single pull of the trigger.
Most shooters, first- or third-person, and most players of those games, have a bias towards one of those skills or the other. The gamers tend to think of their preferred skill as "true skill" and say that games which don't cater to it are "luck based" - of course, the games they do well in are "better" - obviously.