Numberphile doesn't do any education. That's like saying the Discovery Channel is educating a new generation of zoologists.
If topics are presented engagingly these efforts will no doubt inspire the next generation.
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.
I simply don't care to gatekeep what counts as education. It has taught me things from videos I can still recall a decade later and pushed me to explore different areas of math I wouldn't have done otherwise.
It's education for whoever finds it educational