I notice that this user is currently flagged as a new contributor on the main site (see here for example) despite the fact that he has been a member of MSE for quite a while and has plenty of rep points, badges etc. What he hasn't done, though is asked any questions.
This post on Meta.Stackexchange says that answers as well as questions are taken into consideration in determining if a user is to be considered new.
What are the criteria for flagging contributors as new?
In the linked posts from the main meta site, it says:
The new indicator works by the age of a user's first visible post.
This could be a question or answer, and the association bonus won't influence the behavior. While you might not be new to our engine, everyone is new when they first join a new community, so the indicator is shown.
A literal reading of this is that a user is "new" as long as their oldest visible post on a particular SE site is less than $N$ days old (according to this post on the main meta, $N=7$). In the case of the cited user, their first visible activity on MSE appears to be an answer which they posted on the 15th of September (four days ago). Yes, their account has existed for more than two years, but they have not been visibly active during that time (they may have deleted questions or answers).
More details regarding the workings of the "New Contributor" label can be found in answers to this question on the main meta (thank you, Martin Sleziak, for finding this post).
