From the article: "While teachers may be intending for these tools to be strictly educational, students often have different ideas. According to a 2014 study, which surveyed and observed 3,000 university students, students engaged in off-task activities on their computers nearly two-thirds of the time.

Horvath blamed this tendency to get off-track as a key contributor to technology hindering learning. When one’s attention is interrupted, it takes time to refocus. Task-switching also is associated with weaker memory formation and greater rates of error. Grappling with a challenging singular subject matter is hard, Horvath said. For the best learning to happen, it’s supposed to be."

The technology encourages task switching, which is detrimental in situations where one is supposed to focus on a single challenging task in order to optimize learning. So in this case, I'd say it's the technology itself that is unsuitable for the task at hand. Clacking keys is fine, I went to university in the late nineties and computers were already an important part of my education. But I didn't have access to the internet on a powerful pocketable device during lectures. The computers were in the computer rooms.