No. A well formulated ketogenic approach allows for adequate protein to help retain muscle. Protein is recommended to be around 1.5-2g per kg body weight in a ketogenic approach, depending on your activity level. The more active you are, the higher your protein intake is likely to be. In addition, it can protect muscle more than a high carbohydrate diet for people who have insulin resistance. The state of IR can prevent energy (glucose) entering the muscle and allowing for adequate fuel. This makes the glucose being stored elsewhere, contributing to fat gain and fatty liver (other health complications). In addition, the oxidative stress than can occur from high blood sugar levels can contribute to muscle breakdown, and encourages your body to produce more insulin. Over time this approach leads to insulin resistance and your body