One thing is true: "You will not escape the cry." What they're describing in the article, "extinguishment", sometimes works, but sometimes does not. Also, what long-term impacts does leaving a child alone to cry at night have on their memories, their well-being, and their relationship with their parents? (I almost said mother, but we have to acknowledge that it is both parents who are leaving the child alone.)
I recall using a different approach with my daughter. I left her alone as she was playing one day for a few minutes when I went round the corner in the kitchen, keeping an ear open for any distress. I also left her alone sometimes when she was playing in the nursery. The door was open and she could hear me puttering around. In the evening her dad or I would read her a story when we put her to bed (awkward as we had to stand by the crib) and then we would be in the room until she fell asleep, reading, folding laundry, etc. We had some kind of noise cancelling thing we would play that made the sound of a heartbeat or ocean.
My daughter stopped taking naps when she was less than a year old which was inconvenient for me, but I adjusted. With my son, he ended up sleeping in my bed until he was about 13 months old. Every time I would try to lower him into the crib after feeding him and rocking him to sleep, it would trigger him to wake up. He also stopped napping at a young age. I was sleep deprived for about six years, LOL!