I don’t particularly agree with his impression that the average user doesn’t benefit from open source, or that they should know anything about open source.
The only popular operating system that isn’t based on an open source kernel is Windows. Nearly every mobile phone in the entire world is running an open source kernel. And I’d bet that nearly every computer system in the world has at least some open source software running on it.
And who cares whether the average user knows about open source software? The average Blender user doesn’t use it because it’s open source, they use it because it’s the best 3D modeling software. The benefits of open source software are usually what makes it enticing to people who have no idea what open source is.