It is an educational game, if it was something else it wouldn't have been on the list.
Just because it's not classified as an education game does not mean it isn't teaching.
The article clear says
"“Of course, games are already being used in education for teaching maths, chemistry, and developing cognitive abilities, but I don’t think we’ve ever encountered a game being officially included in the educational system on a national level as a school reading,” said Grzegorz Miechowski, CEO of 11 bit studios."
They clearly say there is already games on the list, this is just the first time a game is classified or put into the "reading" category.
Which is cool, but I don't get why this is news beyond being a giant ad.