"Orthodox" in Russian is "pravoslavny", literally "right faith" (pravyj = right, correct). I think it also contributes to the meaning. "The right way".

Yes and no. Orthodox church is called “православная церковь”, yes, but the word “ортодоксальный” still exists to describe e.g. orthodox jews.

The word “православный” in a meaning of some object/technology/way being good and true only started being used in Internet culture during 00s, and it still used, but as a slang/joke.

Means the same thing in Ireland too! My understanding is it derives from greek for “ordinary teaching” we also use the term heterodox for a cultural setting that encourages different types of thought.

The term Paradox is a challenging or somewhat contradictory idea.

We also use the term orthodox for a right handed boxer. “Southpaw” is non-orthodox left handed.