Nobody ever said "x fixes everything" where x= kreen, ARX, motor flush, SLOB, LC20, etc.
Each has its own mechanism and potential beneficial uses.
ARX is one of the products that can do good things and provide benefit in some cases, doing it safely and soundly.
Doesnt mean it is a miracle elixir. The only real miracle cure is a complete detailed teardown with cleaning of every single part in a parts bath, then rebuild.