Infinite horizontal scrolling in a timeline

It's known that infinite scrolling may be harmful for the usability and that sometimes it's better to set an end and provide a button to show more content.

My question is, in a web application context, what would be the impact of infinite horizontal scrolling on a timeline like this:

http://almende.github.io/chap-links-library/js/timeline/examples/example02_interactive.html

In this example, horizontal scrolling is done by dragging and dropping the timeline, so it is not continuous. Users have to click each time they want to scroll. Isn't that similar to click in a button to show more?