Probably as the creator already stated. He/she used their “actual policy positions and political records”. Maybe you should learn to read properly before asking dumb questions.
You mean the Reddit where a lot of people say that their political compass result is not reflective of their actual political ideology. Is that the BS page you’re talking about?
This was taken from Twitter. While it may have originated on Reddit, a political science professor posted it on Twitter, showing how the site has flaws.