You're describing a situation where you see, for example, that someone has an income that isn't consistent with the benefit he's receiving. So you can intervene at any time and tell him that's not appropriate.
This isn't the same thing here. The minister is being relieved of the obligation to request it each time, to repeat requests. So when you see that an individual has income that is not consistent with his benefit, you intervene under clause 4 and you tell him that he is receiving too much or not enough. You're not required to wait six or eight years in order to tell him.