True, a high-protein diet does indeed strain the kidneys. Pancreatic enzymes taken after eating, however, break the protein down into smaller components that are easier on the kidney.
With pancreatic enzymes, renal patients can benefit from eating enough protein for good nutrition, yet preserve their remaining kidney function.
I know a person with chronic kidney failure who's taking the enzymes, eating adequate protein; the only person in the program whose blood tests are not showing sustained decline in kidney function. (And no, I don't work in the enzyme distribution chain.)