Really quick yes or no, do I need to replace the throttle body on my Clio? It's exhibiting signs of cavitation damage, but I don't know if it's bad enough to replace or not.
Considering the metal is coming apart, yes you need to replace it. This is with the thought: Where does the metal go when flaking off? The answer, directly into your engine, where it can cause damage to the cylinders, pistons, valves, and possibly seats. Replacing the TB now will prevent future engine damage.