Actually, I qualified in medicine in 1991.
But you don't need to be signed up to the GMC to understand that breastfeeding past 6 months has health benefits for a young child and doesn't indicate an addiction. If KM made the comments alleged in the OP, then she is clearly wrong.
Here is some useful information from a very reliable source, the National Institute of Health in America. https://pmc.ncbi.nlm.nih.gov/articles/PMC11597163/
I quote
"Breastfeeding is globally recognized as the optimal method of infant nutrition, offering health benefits for both the child and the mother, making it a public health priority. However, the potential advantages of breastfeeding extend well beyond initial months. Breast milk adapts to the evolving needs of the growing infant, and its immunological, microbiological, and biochemical properties have been associated with enhanced protection against infections and chronic diseases, improved growth and development, and lower rates of hospitalization and mortality. This review explores the evidence supporting the continuation of breastfeeding beyond six months."
and
"Children breastfed for extended periods experience lower rates of infectious morbidity and mortality. Growing evidence suggests that longer breastfeeding durations may also protect against overweight, diabetes, allergies, and other chronic illnesses later in life, and contribute to fewer dental malocclusions and higher intelligence scores compared to shorter breastfeeding durations or no breastfeeding at all. These benefits persist into later stages of life"
Also
"As previously established, breastfeeding not only benefits infants but also offers considerable advantages for maternal health. It can lower the risk of breast, ovarian, and endometrial cancers, and potentially reduce the risk of diabetes, hypertension, and hyperlipidemia"
Quite apart from "emotional closeness through intimate skin-to-skin contact. ...a calming effect and enhancing the overall bonding experience between mother and child" and so on.
The thorough review linked above cites 178 scientific papers in support of its various arguments.