You can certainly research this person, post comments to the profile (in this case it is only mildly useful, since you're the manager), and discuss Etienne de Sancerre on G2G, but you won't be able to edit the profile until you have the pre-1500 badge. You will have to rely on other people to improve the profile.
There are criteria for receiving the pre-1500 certification (see Ros's reply above) and having adopted pre-1500 profiles is not one of them.