Please note that this guy's blog has a subtitle of Has someone just said “lowlevel”?. whitequark is discussing the Raspberry Pi from an embedded point-of-view. If you only intend to use the Raspberry Pi to teach Linux and above (or anything that's built upon an OS), then this article is not for you. This is for people who intends to use the Pi to teach lowlevel, embedded programming; teaching how a computer works on all levels.
> He said "education" with any further qualification.
Sure. And the Hacker News crowd loves people who point out statements that are not strictly true. Hey, who cares what the author actually meant, this line here is wrong!
I would agree, except that this is the title of his post. You have to read a bit into the post to realize that what he's talking about has very little to do with what his title states. A very generic term was used when the intention was for one very small niche of "education". After reading the article the title suggests that because it might be difficult to write a graphics driver for a somewhat undocumented chipset then the whole thing is unsuitable for teaching a kid something like, let's use Python since someone else mentioned it.