This option can certainly increase corruption. It doesn't do so directly--its immediate effect is the opposite, to decrease corruption--but as a secondary effect, political corruption will rise the farther away political freedom is from a certain ideal point. That is, if there's a very large amount of political regulation, there will also be political corruption, since there are so many people and systems involved. But if there is no regulation at all, there will also be political corruption since there are no regulations to stop, for example, vote-buying.
Arguably this issue option should shift its particular political freedom modifier toward the ideal point rather than toward the extreme, but that's up to Issue Editors.