I think this claim is partly true but not fully proven. The article explains that some experts believe eating more protein than the body needs could put extra stress on the liver. However, research also shows little evidence that high protein diets cause liver damage in healthy people. In fact, some studies suggest whey protein may even help reduce liver fat and improve cholesterol. The risk seems to be greater for people who already have liver disease, since their liver cannot process protein as well. For them, eating too much protein could lead to harmful levels of substances like ammonia in the blood. Overall, protein itself is not dangerous, but taking very high amounts without medical advice could be risky. It’s best to balance protein intake with whole foods and consult a doctor if someone has health conditions.
https://www.healthline.com/nutrition/whey-protein-side-effects
