"Putting the video out there" is an experiment. It's not rigorously controlled, but it's about as controlled as a website is likely to get. So they put something out there, see how well it works, and maybe tweak it.
That's the very essence of scientific experiments. You don't always need a "hypothesis" to do science. (Or, if you like, the hypothesis is "This video will teach students to do X.")
That's the very essence of scientific experiments. You don't always need a "hypothesis" to do science. (Or, if you like, the hypothesis is "This video will teach students to do X.")