While going into the "review" tab, to review items, I noticed this:
It explicitly specifies that a user needs at least 1k rep to approve or reject "Suggested Edits". It says that Andrea made 2 suggested edits today.
Is that a bug, or an exploit?
To suggest an edit and to approve an edit are two different things.
Anyone can suggest an edit (even without an account). These suggested edits are then waiting in the review list until approved by either :
Those users can reject, accept or improve a suggested edit by adding their own changes. The latter action removes the edit from the queue immediately and two separate sets of changes are added to the history of the post.
In this case Andrea accepted two suggested edits to his own post (improving one of those two suggested edits).