When Hagens hosted the eighth season, he didn't knew the Mole at all, in the ninth season he was informed halfway the series and in the tenth and eleventh series he knew it from the start.
When Hagens hosted the eighth season, he didn't knew the Mole in the beginning, but eventually was informed at the fifth episode. In the ninth series he didn't knew the Mole at all, but in the tenth and eleventh series he knew it from the start.