I don't think "Protein Poisoning" is of serious concern. The dietary guidelines people could find no suitable upper limit for protein. But I agree that it would be better to know more about these diets.

Importantly, I don't think many people would say that <45% carbs qualifies as "Low Carb". 20% or 26% carbs is a more typical threshold. For example: https://www.ncbi.nlm.nih.gov/books/NBK537084/ https://www.aafp.org/pubs/afp/issues/2006/0601/p1942.html