It became very unfashionable in the RCC to preach about the reality of hell for many years. I certainly never heard mention of it in CCD. I believe it was Pope John Paul II who said in one of his books that we must not forget about it. It’s ugly, and we don’t have to like its existence, but Christ Himself spoke of it, along with many of the apostles and saints… so we do need to contemplate its impact on our individual faith journey.
I liked the term in the article, “mercenary fear.” I imagine that refers to the stage of faith where we obey God simply because we want to go to heaven, and not out of true adoration.