If your question is whether what you consider too much protein could cause Kidney damage, in healthy folks, I have read a few papers that debunk that supposition.
If you however want to know if "ADEQUATE" protein is essential in a well formulated ketogenic diet, I tend to go to the guys who know best. By that I mean the people who have looked into it, studied it, and base their opinion on hard facts.
This is one such opinion
Nope https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1262767/ Not without kidney damage being present and even then...
Although excessive protein intake remains a health concern in individuals with pre-existing renal disease, the literature lacks significant research demonstrating a link between protein intake and the initiation or progression of renal disease in healthy individuals. More importantly, evidence suggests that protein-induced changes in renal function are likely a normal adaptative mechanism well within the functional limits of a healthy kidney.