This is a direct quote from Petzl
"For plastic or textile products, the maximum lifetime is ten years from the date of manufacture"
It's "Date of Manufacture", not date of purchase.
The maximum lifetime means, the rope has been in storage and has never been used aka it has never been opened.
I also checked your Craigslist post. Your pictures show few things: name of the rope, diameter, length, rope type (single), and the method of dry treatment.
None of these are serial code or core thread color (Petzl rope's thread color denotes the rope's year of manufacture).
I don't usually ask for the date of manufacture, but you did tried to sell used Grigri 2 at 10,000 ~ 5,000 won above market value after doing "research", so I'm not sure if you are trying to scam a new climber or expat or you are just hopelessly clueless.