I was also born in 1990 and I feel like I also experienced some of the things she ascribes to gen X. In the end generational boundaries are always going to result in overly simplistic characterizations. However in the context of the article it's probably helpful to see millennials as a transitional generation.

The tech-literate millennials definitely still shared the tail-end of the internet that gen X was familiar with. However there is also a big part of our generation that only really experienced the web through social media starting in their late teens or early twenties.