He's just making a distinction between his role as an employee of the club vs. Levy's role: as a manager he's judged from game to game and knows that, and isn't someone who wants to given 10 years to get things right.

But inevitably it'll be eagerly misinterpreted/misrepresented, as the Express have done already with the headline "Mauricio Pochettino drops HUGE hint he will leave Tottenham for Man Utd or Real Madrid"