Maybe. But they did a version that was less obviously biased through an actual polling firm and got these results which represent libertarians as eight times more common than the number of people who identify as libertarian. Now maybe there really are those kinds of sympathies for the libertarian position, I'm not sure. But it doesn't give me a lot of confidence since the one online is worse.

But even if it doesn't skew libertarian it still lumps way to many people as centrist for it to be particularly useful. And any test that labels people as "authoritarian" (something usually reserved for totalitarian regimes) is pretty ridiculous.