For context for those interested, Article 3 of the Spanish Constitution says the following (translated into English):

"1. Castilian is the official Spanish language of the State. All Spaniards have the duty to know it and the right to use it. 2. The other Spanish languages shall also be official in the respective Autonomous Communities in accordance with their Statutes. 3. The wealth of the different language modalities of Spain is a cultural heritage which shall be the object of special respect and protection."

No, that article doesn't say that, that article says that Spanish must know Spanish language.

And if people holds sacred the contituion, the TC didn't invalidated the linguistic immersion, it is constitutional