Not sure if you're native Spanish speaker or not, but nacionalidad is nación when talking about a group of people (simplifying as typing from mobile)

The count is of about 30 different articles. Here's a comment from El País (hardly pro-indy or pro-catalan) about it: https://elpais.com/diario/2007/07/05/espana/1183586424_85021...

I'm a native speaker, yes. You say "The Spanish Constitution says Catalonia is a nationality". It does indeed (emphasis mine):

La Constitución se fundamenta en la indisoluble unidad de la Nación española, patria común e indivisible de todos los españoles, y reconoce y garantiza el derecho a la autonomía de las nacionalidades y regiones que la integran y la solidaridad entre todas ellas.

The Andalusian estatuto almost uses the exact same words, "nacionalidad historica" in the "unidad de la nación española". Can hardly be considered against the Constitution. Agreed?

One can argue that "Cataluña es una nación" is a valid interpretation of the Constitution (I won't, because I'm not a constitutional lawyer and I don't think you are either), but you can't really use the Andalusian estatuto to support that the Tribunal Constitucional gives inconsistent rulings. (And has the Andalusian one even been challenged? I don't think the Tribunal Constitucional can strike down laws that haven't been brought to them).

That's the thing: The Andalusian hasn't been challenged, while the Catalan is scrutinized to the detail and the party that's now in government gathers 4 million signatures against it: https://elpais.com/elpais/2006/04/25/actualidad/1145953019_8... (They wanted all Spain to vote on the Catalan Estatut!!! Would they do that for all regions???)

Maybe no one has challenged it because they don't see a problem with it?

Of course there's no problem. There's no problem with the Catalan either, apart from the fact that it's Catalan.

Again, neither of us are constitutional lawyers, but for an argument like that you have to present and challenge the arguments used in the actual sentence. Conspiracy theories without backing are only useful to those who gain political capital out of them.

And for the record, I read that, back in the day, Ciudadanos asked the Defensor del Pueblo to bring the Andalusian estatuto to the Tribunal Constitucional. Not sure if he did, or who can and cannot bring laws to their court.