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> For example, Object Oriented Programming became Functional Programming

What? No it didn't. An imperative language is the opposite of a declarative language. OP might want to edit this one.

It is pretty clear that the author meant OOP -> FP with respect to popularity and NOT literally transformed from one to the other.

Indeed. Right there alongside acknolwedging OCaml (albeit capitalized incorrectly) as a functional language, no less.