Just to make it clear, Progressive Leveling System does not equal Role-Playing Game; It is just an RPG element.
Well this is not true, it actually has more character developement than older elder scrolls games. Perks change a lot about your character. But it's lacking options, mainly in dialogue / quests and TES games never have had any real options.
I don't think that's the kind of Character Development they meant, an RPG always has a narrative and that narrative can change based on the actions performed. The character's development goes along with that narrative, the problem with skyrim is the story is pretty short and so it's narrative suffers with it. It is still an RPG but it's a very lite RPG compared to other proper RPGs around. In my opinion fallout 3 is more of an RPG then Skyrim since the actions you take have consequences or effect the storyline in some way.