If he got involved in a review of a program where he has a conflict, there's plenty of discontent government employees who would blow the whistle, moreover, if he made any recommendations relating to this, it would be obvious.

Regarding personal data, I'm not sure what technical safeguards they have in place, but given the potential reputational harm to the Trump admin if anything leaked, I'm sure they are doing everything possible to avoid touching it whenever possible, and anonymising it when they have to process it.