I assume that a considerable percentage of CS students or recent graduates (myself included, back in the day) dream about creating some sort of visualization tool, let alone an awesome one like this.
Sometimes knowing how to do something isn't nearly as important as badly wanting to do something
For some it can be far easier to find knowledge than it is to find motivation
It's more likely having a specific immediate use case - creating his videos - was more important. Usually creating something for some abstract future use(r) will lead to almost zero motivation, at least for me.