The literal next sentence after your quote was addressing the feasibility, of which it is clearly feasible because people actually are reverse engineering games at scale.
The point I was trying to make is that understanding and modifying software to do your bidding is significantly more feasible if you already have the source code than if you have to reverse-engineer it yourself, to an important degree.
The point I was trying to make is that understanding and modifying software to do your bidding is significantly more feasible if you already have the source code than if you have to reverse-engineer it yourself, to an important degree.