There are 20 clubs in La Liga. You are literally wrong.
So you would classify Villareal in the same group as RM, AM and Barca?
You are really getting worked up on a term that has no defined set of what it has to be. There could be 3 top teams 12 mid level teams and 5 bottom teams. Nobody said each group has to be the exact same number of teams. In fact doing so would be a stupid way to judge them.
i will change it to 2nd tier team if that makes you feel better, doesn't change the point at all but maybe then you take a breath and get over your pedantic concerns with the wording used to point out the FACT they are not a top La Liga team.