The one person's Dr. told her that the main issue is that she was eating way too much protein. Which might mean she wasn't doing Keto quite right. But I don't know enough about the diet myself to say for sure.
I was concerned about that and had my liver checked a couple of years ago but it might have been too early then. I'll brush up on that.
No one has an eating too much protein problem. The average person has a sitting on their ass problem that leads to all kinds of health issues, especially when combined with a too many calorie problem.
There is absolutely no evidence that long term high protein consumption leads to these things.
The "your kidneys will fall out" nonsense has been circulating since I first started hanging out on alt.support.diet.low-carb in the mid-90s. Probably since Atkins first published his book. It's superstition.