I think it is important to know the difference between helping a child learn self soothing techniques and just letting a child scream on and on and on.
Despite what the doctor told the couple in the article self soothing is not letting a baby scream it out. It is making sure they have a means such as a pacifier or lovey available that they can hold and which parents know helps calm them down. But a parent should always respond if the crying becomes frantic or lasts more than a few minutes.
A child learns “self-soothing” by BEING SOOTHED, and in no other way.
What these child abusers call “self-soothing” (they are soothing their own consciences) is exhaustion, despair, and BRAIN DAMAGE.