I'm around 20 and I prefer text over videos. I find videos too long, sometimes exaggerated. Even if I have to watch a video, that has some "content" I'd increase the playback speed to have it done faster. In my opinion, visual instructions give in a lot of unnecessary information than textual instructions. This makes it harder to imagine when watching a video than reading a, say blog.

Easier to multi-task maybe? Its really easy to do other things while listening to a video and then jumping into the parts that sound interesting as compared to reading where its necessarily a very active experience.

Perhaps your students read slow or very inefficiently. Since their reading skills are poor and they value their time very highly they can easily budget their time against a video with a defined length vs reading a text that could take more time due to said reading skills. Also, with features like adjusting playback and skipping over parts they understand faster without having to worry (ie: they can't just skip a paragraph or page of text because something might be mixed in with the stuff they understand).