I "know" the PLO

It comes to the interview. I ask general questions. We are talking about his current job and responsibilities. And I hear:
“When I came, there was horror there.” Well, I began to introduce OOP little by little, rewriting everything into classes ...
- What for? What is the advantage of OOP before procedural approach?
- In OOP, I can group functions into one class ...
- What for? Write them in one file. How are classes better?
- ... (at the interlocutor stupor)

These were thoughts out loud