Not sure where you read that, but the S/C and N/A engines use the same crappy paper LIM gaskets. The gaskets on my N/A 3800 started leaking coolant onto the bell housing at around 50k. I've since replaced them with the newer aluminum gaskets and all is well.

Not sure if that's specifically the problem you're seeing, but it is probably contributing. If 100k miles are on the engine I guarantee they're leaking. I've seen them leak in a variety of ways from oil mixing with coolant, coolant mixing in to the oil, oil pooling on the LIM area, coolant dripping down the block, etc.

For what it's worth, the guy was wrong about one thing. The gaskets are not "eaten" by anything. They fail over time as a fact of a faulty design. That's why GM redesigned the gaskets, not changed the fluids used. If you've ever installed the new gaskets you see why they don't fail. They're thick and rigid and the stock gaskets are complete crap when you take them off.

Anyway, hope this helps.

Edit: Here's what the new gaskets look like...

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