It’s the opposite (as far as I could find). Pronouncing “c” similar to “th” is only done in Spanish in Spain. In Catalan (as well as Latin/South American Spanish) all pronounce it like “s”.
Castilian and Catalan are two different things, I think the previous poster may have just misinterpreted the top level post which was not wrong about C being pronounced as the English TH.
It’s the opposite (as far as I could find). Pronouncing “c” similar to “th” is only done in Spanish in Spain. In Catalan (as well as Latin/South American Spanish) all pronounce it like “s”.
Castilian Spanish is the dominant dialect of Spanish in Spain.
Edit: A helpful map:
And that’s the point, I believe. Catalan is not a dialect of Spanish.
Castilian and Catalan are two different things, I think the previous poster may have just misinterpreted the top level post which was not wrong about C being pronounced as the English TH.
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There is no mention of catalan in my post because it wasn’t about catalan. 🙃