I understand your assumption, but the way things have worked out, if anyone is discussing a Surface tablet, you have to assume they are talking about Surface Pro, unless they specifically say Surface RT. You might not be familiar enough with the tablet market to have known that. Similar to how when someone says “my macbook” they typically mean Mac Book Pro, unless they specifically say Mac Book Air.
Also, I find if there is any ambiguity, reading the linked to articles more often than not clears that ambiguity up 100%. In this case if you were unclear if the blog post was referring to the Surface Pro to the Surface RT, reading the linked to article clears it up immediately. Not all BoingBoing blog posts are articles themselves, sometimes like this one, they are simply point one onward to an article with a brief intro. Understanding this key fact will greatly improve your BoingBoing experience.
Cheers.