I think it is more about what the source of protein is than the total amount of protein. In the study Dr. Antonio performed, where they increased protein intake to ridiculous amounts (somewhere in the 3 g/lbs), all biomarkers for the kidneys actually improved. However, all the additional protein came from whey.
If I was to eat that same amount in just chicken breasts and nothing else, I would still consume around 30 g of saturated fat a day. This would definitely lead to renal lipid accumulation and clog blood vessels in the kidneys. Kidney biomarkers would go down and protein would be to blame, but it was not the protein that did the damage.