Does high protein intake raise ammonia?
In healthy people, normal and moderately high protein intakes do not usually cause ammonia to accumulate. Amino acid metabolism produces nitrogen waste, but the liver's urea cycle converts ammonia into urea so it can be excreted.
That does not mean context is irrelevant. Liver disease, urea-cycle disorders, advanced kidney disease, certain metabolic disorders, and medically prescribed protein restrictions change the risk picture. In those situations, protein targets belong with a physician and registered dietitian, not a generic fitness calculator.
For healthy lifters, the bigger practical issues with very high protein are usually appetite, digestion, food variety, cost, and whether protein is crowding out carbohydrates, fats, fiber, and micronutrients. Most people make better progress by hitting an appropriate target consistently than by pushing protein as high as possible.