The article's premise is that having one's core psychological needs go unmet is like having a broken bone.
If you take away the pain from a broken bone, you still have a broken bone. As you say, there is nothing wrong with taking the pain away. But the bone is still broken, and limits you in ways that a healthy bone would not.
Taking away the symptoms of an unwell psyche still leaves you disabled, even if it isn't as outwardly evident as a broken bone.