Yeah, I think the original article does a fine job of calling attention to that. The reporting here is pretty misleading on the point, though.

The narrative here around a precipitous fall in traffic is a complete artifact of Alexa's measurement. If you look at the graphs in the original Vanity Fair piece, there's a huge discontinuous jump up in Breitbart traffic in December, and a corresponding discontinuous jump down in May. This likely has nothing at all…