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https://en.m.wikipedia.org/wiki/European_emission_standards
A 10 years old car would fall under Euro 5b standards instead of Euro 6d, there's also a level of tolerance when a car gets tested so it might have beat the standard by a good margin when it was new, it still passes the test 10 years later because it's still under what's allowed but not as good as it was when new.
CO2 emissions don't get filtered by the anti emissions equipment, they're the by-product of combining the CO emissions with unburnt hydrocarbons, it's 100% based on how much fuel is burned by the vehicle and that's it. Anti pollution systems do reduce NOx emissions by splitting it and Euro 6 tolerates less than half the NOx emissions that Euro 5 does while also reducing the tolerance for HC+NOx (talking about diesel here, since the standards were the same Euro 5 to Euro 6 for petrol vehicles).
Euro 6 also introduced particle emissions for petrol cars, which only existed for diesel vehicles under Euro 5. Euro 7 is coming in 2025 and will add NH3 and brake pads particles into the mix.