It's education for whoever finds it educational
Young people are curious, sometimes all they need is a spark and to be introduced to a new topic in an engaging way. These forms of content deliver that spark.
Plumbing, react, combinatorics, real analysis, python, c++, cad, micro and macro economics, reinforcement learning, to name just a few of the things I learned through YouTube.
We don’t give enough credit to what we take for granted today.
This is exactly what Numberphile does. Those who are hooked will find the resources on their own. They need a reason to look for them and Numberphile gives them one.
However I will push back on the claim that inspiration is not education. It may not be sufficient on its own when resources are not readily available. But now that they are it's the inspiration and persistence that are the missing magic sauces.