Okay, but psychology research like this needs to be taken with context on long term behavior. Is this advice practical? No, not in this case. The problem is that very few people can actively learn that way for multiple hours in one day, let alone be motivated for studying in that intense way for subjects they do not like. Any barrier will stop them. That research applies to cramming for exams, when stressed, which most EdTech isn't really useful for (at that point, people are learning intensely anyway). This human nature has not changed.
And your suggestions (not to be rude) are to excite kids about the subjects they find least motivating. But the problem is already motivation.
Youtube is motivating because it is fun. It might not work, but it fits the motivation level you have.
Why not forget about the strong moats/tendencies of EdTech projects to fail to revolutionise, forget them targetting parents, and either pick a subgroup of learners who actively do want to change how they learn, or work on the motivation problem? Why are some kids so much less motivated to learn Math than others? Should we change that and how can we?##
Here's an example I find interesting: The western world accomplished bringing Biology from dominantly male to an equally balanced subject. How did that change happen? We benefit from all these women researching in Biology. Could it happen to other sciences? Or the reverse? These kind of questions interest me.