It is not true that drinking a lot of water can cause uremia.
People with normal body functions who drink a lot of water usually do not cause uremia, although water is metabolized by the kidney function, but generally does not damage the kidney function. Drinking more water in moderation also has certain benefits to the body, such as speeding up the metabolism.
However, if you have kidney disease yourself, such as glomerulonephritis, nephrotic syndrome, etc., and your kidneys are not functioning properly, drinking a lot of water will lead to worsening of the edema symptoms, which will aggravate your condition.
Healthy people can drink more water moderately, but if the patients themselves have kidney disease or other underlying diseases, they need to control the daily water intake according to the advice of professional doctors to prevent further development of the condition.