What they are saying is, because of this event that happend 10+ years ago, they had an event that altered them & created trapped emotions in the body. Trapped emotions in the body lead to disease, cancer, autoimmune disease, skin conditions, strokes, constant stress, anger issues, digestive issues etc. Someone who does this is constantly reliving their trauma. The redundancy of that cycle of thinking-feeling & feeling- thinking conditions the body to subconsciously become the body of that emotion. The body is living in the past. The body becomes your unconscious mind. The body believes it's living the same experience 24/7-365.
To change, you have to become greater than the body. Living in the familiar past is connected to everything known in your life. What they do is their daily habits, checking texts, calls, social media etc. A person does everything known & are familiar with it. This is automatic unconscious behaviors. You have done it so many times, the body does it better than your conscious mind.