I've got a few clients with similar backlink profiles from dodgy articles.
Some of them have seen a minor drop, but not enough of one to make me think there's a penelty against the client. Rather, its more consistent with a chunk of their backlinks suddenly being removed.
Unless the entire backlink profile is articles, I wouldn't worry. It's not going to be as simple as 'He's written articles......geeeeettt hiiiimmmm!'. That would be too much of a gift for blackhatters to abuse.