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Seems like there are two issues they mentioned that you might be asking about:
1. An unexplained coolant loss is normal in this car during the first several thousand miles. Nobody seems to know where it goes. The guy probably never checked it. If it didn't overheat, it's likely not a problem.
You can get an oil analysis for $28 to see if any coolant is going into the oil. I wouldn't let the low coolant stop me from buying it, but I would get the oil analysis done at the first few oil changes just to make sure that if there is any issue, it's caught early to prevent bearing damage. (I personally have an oil analysis done at every oil change anyway, just because I like to see what's going on in the dark recesses of my motor.)
2. Subaru blue coolant is rated for 11 years, but if you mix it with conventional coolant or use conventional coolant by itself the service interval drops to 30K miles. So I would simply flush the system, replace with Subaru blue and drive. Personally, I doubt I'll leave my coolant in the system for 11 years, but longevity is not the only reason to use Subaru blue. The chemical composition of the coolant is preferred for lubrication and conditioning of seals and components in this particular cooling system. The system is designed for it.
I wouldn't let it worry me.
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