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While you might be right, I've seen the same comments about people who did a thorough functional programming class and then having to learn another functional programming language later on.

Moreover, you don't know if the parent also did functional programming.

But I think your remark is a fair one, I think it's about wrapping your head around programming paradigms that are quite far from each other.

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Here's Peter Norvig's advice about different paradigms:

Learn at least a half dozen programming languages. Include one language that emphasizes class abstractions (like Java or C++), one that emphasizes functional abstraction (like Lisp or ML or Haskell), one that supports syntactic abstraction (like Lisp), one that supports declarative specifications (like Prolog or C++ templates), and one that emphasizes parallelism (like Clojure or Go).

(https://norvig.com/21-days.html)

I wasn't just talking about functional. Prolog is a different paradigm all together.

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